>>19814849Her model is rather goofy and oddly rigged, but the salient point is the skin. On-model Sana has a skin tone that, to put it mildly, is not fucking human. It's a gray alien's idea of what brown skin looks like.
Fanart on the other hand tends to make her skin a healthy golden-brown, which unsurprisingly looks much better. A while ago an anon did a side-by-side color adjustment on her vanilla model and the difference is pretty striking.