Tis not too bad, I see you've improved a bit since your first picture, though I'm sure you could still do better. Like, clean up the lines a lil bit (its easier if you make a sketch in a light color on layer zero, then zoom in and go over it slowly in the color you want the lineart to be on a higher layer, like layer one or two.) and make your shading a lil less messy.
If you add a lil more detail and spend a lil more time on your pictures, they would probably be a lil bit better then they are now. :D