Well I did a quick crit sketch on it, ESF seems to have problems with Gohan, I don't like the previous one or this one, it lowers the overall quality as the other models just seem to be fantastic for an HL engine.
The red is basically the pattern of how the Gi actually flows and how the mesh should work out to be. The green is just a quick sketch I did so that you could basically see how the Gi is hanging off of his body.
Teen Gohan is only a child remember that, so he isn't going to be big and muscle bound, his muscles are still going to be relatively small.
His neck needs to be smaller, remember, small kid, small muscles.