>>3772544The contours are too messy. It can look great if it's a good sketchy style but yours is obviously not. Also, drop the thick black lines from her hair, because they don't have any function, they just look hideous.
Also try to construct the face a bit better. Are you coming from drawing anime and stuff? Because I can feel a bit that in your drawing...just drop anime stuff or at least try to forget your anime manners when you are drawing studies.
Hope it helped at least a bit. Keep it up!