it is a good attempt :D the problem areas I can identify would be that the drawing looks very faded to me and there can be sharper distinction between the light and shadow areas like the crotch area is of the same darkness as the legs or arms. Similarly with where the forehead meets the knee and the area of the chest which is in a tight space because of the interlinked arms and the knee and the tilted face, that area should be darker. The lines need work too, the one on the left knee is way too broad and not dark enough. I think it looks out of place because you have lined the drawing very consistently. You could instead try to vary the thickness at places and use broader strokes where you need to create the illusion of depth, don't outline the whole thing. I really like the shading you've done on the thigh there and I'd love to see more of your work :D