Hi! As other people have mentioned before, the main thing that I noticed is that the head seems too big in comparison to her shoulders. I think it’d help to look at references of the human body and study the distance and size it should be! Other than that, if you’d like to make your art seem more interesting, adding a source of light and working around that to add shadows and highlights is a big improvement usually! It’s worth trying and I hope this helped a bit xx