So a simple way to do shadows is to pick a light direction and add shadows to the areas that are away from the light. Cell shading is the simplest way to do it. I hope the paint over is helpful :)
WOW!! It looks so much more alive!! The proportions look much better, especially the hand on the hip. Now I also know how to do the shadows better. And the hair OMG. It looks so natural and flowy! It's giving the scene hairstyle i was going for. Thank you soooo much!!!^^

