I can't see the image.
Edit: My bad.

I agree with astraldata, and I can suggest to you to find some reference so you can better understand what he said to you.

For example here you can see dark shadows, mid tones and highlights. You only have one color dimension.
Also you should work on anatomy in general, because you don't have body forms defined at all.
Pixeling maybe looks very easy but that's not true. You should practice drawing on paper first, that will improve your skill.