I'd be pretty ecstatic if they would just follow your diagram to update their designs. I think it works perfectly well and captures the essence of the modern imagined Halfling way better than Larian's modelling. The post above was aimed more at fallenj's reaction to heads being too big, but then I launched a big old rambler's digression like I tend to do and didn't really clarify hehe. I'm just an enthusiast as well, with a passing interest in the art stuff, but still thought it important to note that the current Human/Half-Elf models in BG3 definitely seem to show idealized proportions. So even putting 1:8 Shadowheart with legs for miles, standing next to 1:7.5 Shadowheart, people would likely note the difference and react with the same biases outlined in the Loomis diagram. You know, where reality looks "Rather Dumpy" by comparison lol, and everyone expects these Idealized Fashion/Heroes who are all extra tall and extra beautiful, because that's just what we got dished up on the regular for so long.
I think there is probably a breakpoint where subtle preferences turn into much stronger aversions, and if they want to avoid the latter, to bear in mind that many players will prefer to play a more beautiful PC. Even if the starting point is like Githyanki levels of ugly, players will still find a way to be choosy about it hehe. I think the trend towards 1:2 Halflings in the post 3e depictions moves in the right direction, not just to distance D&D Halflings from the Hobbit phenotype but to make them more objectively appealing. To put it even more crassly, Hobbits aren't attractive, and Hobbits could never be hot. At least not in the way that Humans/Half-Elves typically are, but Halflings at 1:2 very well could be, and I think players would immediately respond to that by rolling them more frequently as PCs. It's a test case in the making. They just need to choose to make Halflings more beautiful according to the Standard standards (whatever they're using for their Humans) instead of gangly cartoon characters. Leave that stuff for the Gnomes. Half-measure compromises will probably only produce middling results, with the race remaining pretty niche. Whereas if they start from a scale that is more appealing and go from there, I think they'd see a much stronger positive reception.
Just for further clarity, your wireframe diagrams are already showing what I wish they'd do in BG3. Even if the base Human head to body ratio there is more realistic compared to Larian's idealized Humans, at least the Halflings still look roughly like Humans at 1:2 scale in your image.
Sure there's some compression in the limbs and some style choices, but they definitely don't look like Dwarves at 3:4 which is how Larian's Halflings appear to me.
You can see from the image at the top of this page, I reduced Larian's Halfling model to 70% in order to make a Gnome and yet her skull still appears as large as Shadowheart's standing next to her on the rock even at that reduced scale! That's beyond ridiculous.
It's not even just a 3e thing though, I mean look at the portraits of Alora from BG1 and Mazzy from BG2...
There's a reason why they close cropped the portrait, because the subtle shift away from Hobbits towards 1:2 has already occurred by that point. At least in the portrait and promotional art. They still had the big feet in avatar, but the portrait images show proportional skulls that suggest a more 1:2 figure. Then the LOTR films came out and pushed the popular transformation further. Compare Frodo from the Fellowship of the Ring 2001 to the animated Hobbit from 1977 or Frodo in Return of the King 1980. Those were the extremes of back then. I think D&D should go even further towards 1:2 with the Halflings now, because depictions of Gnomes and Dwarves already have the other visual vibe well covered. If they want Halflings to capture new interest then the 1:2 approach I think holds more promise, rather than a rehash of depictions from the 80s.
Larian's Halflings just look lame. They aren't Hobbit enough to make traditionalist happy, and they definitely aren't catering to the 1:2 modern Halfling aesthetic that's been around for like 20 years now. Instead Larian's Halflings are getting the worst of all worlds, with nobody happy, and the work feels wasted. They aren't doing anything to make me want to play as a Halfling PC with those models, and I suspect the metrics would show way fewer Halfling PCs in BG3 compared to Humans or Elves or even Dwarves. If they followed your diagram instead, I think Halflings would become a top choice practically overnight. I hope they revisit the issue and bring some stronger design chops to the table next time.
Random aside, but I had a thought on how they could do like a Halfling druid village Ewok style, like they live in giant conifers with platforms and such. Maybe since Halflings are lighter and more dextrous they can take the bold jumps, or fall from great heights but still land on their feet like cats, or use cloaks like squirrels to glide. Stuff like that, getting away from the mole hole take and doing something way different with them. More like the Brownies in Willow basically for that one. I think something like that would be a fun twist on the usual snug in the ground take. Or do the same thing but really set underground, go way next level with it, like tiny tunnel shortcuts and repelling in gigantic caverns where the whole Halfling city is built into the side of a cave wall say. Just something to give them a kind of proto-wilderness spot in Faerun that isn't the Riverlands but more the forests and caves next door. The Riverlands Shire thing is kinda done to death, I want to see them branch out and do something a little cooler with it that is Halfling focused, and where they aren't just tacked on to the normal Human civ. I think the crossover between Halfling and Gnome culture could be fun too, as like a meta rivalry thing hehe. Like having them occupy similar zones, places where the tiny tropes can have more outsized adventures and where the Halfling PC can go alt routes or showcase their unique tiny feats. Say the Halflings can climb to reach higher points and such, so they can do more exclusive maneuvering in crazy places where the big old Humans and Dwarves would have trouble managing. Or crossing hazardous terrain more easily or maybe access to places Humans couldn't reach at all. More side zones with the tiny perks and solutions. That was the best part of the Hobbit, and the thing that should be retained. But I think it starts by first capturing the super tiny feel at 1:2. They should totally do low angle stuff with the camera when the PC is zoomed into a drive view too, that would be cool to see. Just the change in perspective drop cam for a start. I'm thinking more about the roaming experience than the cut scenes, but doing it in both really so the idea carries through. Tiny weapons too, I mean it only makes sense. Even if they reserve it more as a big get, I'd like to see halfling swords and bows that are keyed off the 1:2 proportions as well. No reason they can't look dashing and poised with some cool equipment that suits their scale and has some Halfling flair to it.