you've got talent! one thing I'd suggest working on is the shading of your hair. The zig-zag white highlights don't tend to look like they come from a realistic light source. draw a circle or a sun in and shade from that angle:
of course, the light source is all up to you, but try varying the shading and highlights a bit. especially since you're drawing traditionally, it'll give your art a much more wholesome appearance and fight that "flat face" problem brody mentioned.
looking forward to seeing more from you!