I say, you should practice a little on the shading.
Have you ever tried to use the scobs of a pencil after you've sharpen it to shade? It is simple! Just put them on top of the place in the sheet you'd want to shade, and rub your finger around the place, but, beware not to use too many, as it might ruin the drawing.
I noticed that he has no nails. Still in the hands, I would like you to practice in the fingers' pose:
Take a look at it, study, and try to make more shading in the hands!
You can also use that technique that I mentioned before to color the hair; It will looke smoother instead of rough! Also, the body lacks shading, but you can always pratice. Take a picture of yourself in the desired pose, and then try drawing it with correct shading!
I hope my advice has helped! x3
Now, I would like to say that you did a good job in this art-piece, nontheless.