To be fair, the length might just not be visible in that pic. That huge collar could hide a lot of hair!
Personally I'm neutral on this one. I definitely like the asymmetric shaven-sided style so would definitely say no to bald, but whether it has a longer bit at back or not I reckon it still looks cool.
That's true, but it would be a little weird to hide such a pile of hair under clothes.
I'm pretty sure that at least the original idea was short hair, specifically only what we see in the artwork.
Maybe they changed their minds because it's much easier to promote sexy women with soft features and long hair.
But I think that in Karlach's case it was not a change for the better, because when compared to the rest of her body, her hair looks... "inappropriate".
It's definitely not the type of hairstyle you'd recommend for a barbarian warrior.