face is too triangular, flat and doesn't have much definition whatsoever, adding a mouth wont change those problems and people will still nitpick the face.
I'm about to just draw what I think would fix it since I'm terrible at describing. the hair also doesn't cover enough of the head. but i think you already mentioned that needed to be fixed. One immediate thing I noticed was the chin. In fact I think ill just bring up the original picture.

The chin doesn't start closing until below the eyes.
From what i've seen from more accomplished modelers is that they try to form the body right from a profile view, then they try to make it look correct from a side view and then clean it up.(but this process would require a profile pic and a side view pic)
I really hated making this post because I have next to 0 experience with 3D modeling.
I'm about to just draw what I think would fix it since I'm terrible at describing. the hair also doesn't cover enough of the head. but i think you already mentioned that needed to be fixed. One immediate thing I noticed was the chin. In fact I think ill just bring up the original picture.
The chin doesn't start closing until below the eyes.
From what i've seen from more accomplished modelers is that they try to form the body right from a profile view, then they try to make it look correct from a side view and then clean it up.(but this process would require a profile pic and a side view pic)
I really hated making this post because I have next to 0 experience with 3D modeling.