It actually feels like there is a slight perspective error on this one:
The head gear seems to be at a more oblique perspective than the head itself so it looks like it's 'painted on' because of the conflicting perspectives.
The 'shadow' on the underside of the headgear clashes quite a bit with the shine of the top hair too. Since he light focus seems to be frontal on the original, the shadow probably needs to be severely minimized until it's a slightly darker shade of hair on the very top of the head OR the shine at the top of the head removed. Another alternative is to make the whole underside darker and remove the 'shine' of all the hair.
I understand the shadow was probably to distract from the 'paint on' look, but you probably need a better solution i'm not painter enough to notice, even if it's hard with such a rigid surface. The fabric on the sleeves has a much more natural organic shadow look... this is mostly due to the shadow play and organic creases changing the colors and grain. Consider making a slight 'shadow' on the visible part of the back of the hat in addition to the suggestions on the previous paragraph. The underside of the hat color looks fine for a 'frontal light' thing but it also makes the decorative fringe look artificial because of lack of relief. Dunno how to make it better cause not a painter.
All this criticism might be pointless when the images are downsampled to the NDS resolution ofc. No one might notice.