Halfling female head 3 has substantially larger eyes than the others[...]
For the eye itself, my preference would be if we could change the diameter eyeball, and also of the size of the Iris relative to the Sclera (the white of the eye) within a sensible range. I think it would be cool if we could color the Sclera as well, as a feature of fantasy races/classes. For all races it would also be cool to have control over both tones of the Iris set independently.
Larger pupil diameters should be offered for the fantasy races for sure, especially those with vision bonuses. Allowing for larger pupils relative to the Iris or Sclera is a simple way to create a fantastical impression. Using such a feature Tieflings Elves Halflings etc could create a pretty wide variety of distinct looks.
Heterochromia should also be available for any of these options, all races. To allow for Claudia mode as a Human, or to do the one eye blind like Wyll. Using such features one could create many different effects like Fremen style eyes, or Demon eyes all black, or inversions like Zevlor. It could also be used to simulate bloodshot eyes or injury. If the eyes were handled independently, with independent coloration that would grant the widest range of potential looks. It's also relatively simple to do as an independent feature, since unlike facial morphology, the stuff that happens within the eyeball is pretty straightforward, working within the sphere. For the shape of the iris and pupil we could do squares like goats eye or slivers like cats eye or snakes eye etc. Many of the fantasy races or classes could adopt such a look, similar to draconic scales, but made more universal and more flexible. It would be cool to do pupil in stereo as well (similar to heterochromia for the Iris color, but for pupil size/shape). This is useful for all races including human to handle stuff like anisocoria and related phenomena, so another cool option that could go in their along the theme of treating the eyes as distinct. Thinking of possible related options, we might see things like eye patches, or bandages (which we've seen on npcs) or a monocle or wizards specs of the fantasy looking sort, which could increase the variety there even further. The only downside to the effort is that the camera currently can't make much use of the super zoom, but that's more a camera issue than a modelling one. Simple things like sizing shape and color will carry through though. If they put the work in to make the detail worthwhile, then the camera could adapt or headshot avatar view could make use of it. I think players enjoy looking at a face they've created so it could be a window like Char sheet, and I'm sure peeps would pause sometimes just to take in the view there hehe.
Speaking more broadly, if eyes, eyelids and eyesbrows could be handled independently from the main head shape, and treated more cosmetically, that would open up a lot of choices in the minutia. There is a strong relationship between nosebridge height and eyelid shape, but there is also a lot of variety on that one too, so I think it makes sense to be treated similar to complexion beauty marks and the like, as independent. The same way tattoos and scars and makeup are currently treated, more or less. Another popular option I'm sure would be piercings. But all that would be ideally added on top of the Head rather than baked-in.
Again the main goal being to create a system where the player can create an approximation of their own face, and thus anyone's face. But still within the generalized framework of basic heads and basic shapes. Right now I see many repeating motifs where the same or very similar faces are doing double duty, and many others are locked off into just one category, or simply missing entirely. By displaying the heads in rows it becomes easier to organize them and ensure that there is a decent spread and a decent distribution. The priority I think is to capture the human morphology and phenotypes first, then abstract from those into the standards for the fantasy races. Again so there is a through line, and equity, so that one type isn't been favored over another in a given category. More options are available across the board that way.
