This is pretty good but I have to point out a few things.
1) This would look so much better done neatly.
2) The lighting in dragon ball is done mostly with sharp shapes such as triangles.
3) You really shouldn't be reppeled from using reference. Reference is not cheating and it is even used by the animators on working on the show themselves to keep the characters uniform.
This is pretty good but It would be nice to see this polished and put to a background. Grate anatomy though! The position in which they are standing seems very natural.