I see what you were going for in this painting. And I like it. However, there are a couple of things I want to point out.
If this character is female, the shoulders are a bit too bulky, it makes her look a bit masculine.
And about the shading, I think you should make the dark and light tones contrast a bit more, make the dark bits darker and the light bits lighter, I think the shade placement is great but the shading looks a little bland.
Do keep it up, mate, I think with enough practice you're going to do some unbelievably good stuff!