Draw in the detail in the ears (this doesn't have to be too detailed if you don't want). Then start the hair. This is pretty difficult and can wreck the picture if it's done badly. Start from below the ears and leave some distance between your first circle and the hair (hair has thickness). Goten has three spikes on the right side (his left), and four on the left (this switches when he turns his head). The best way to learn how do draw Goten's hair is probably to work from another picture. It takes a while to get the hang of.

 

Erase all the lines from your planning. If you're worried about losing part of the picture, you can ink it as I do, and erase the old lines afterwards (of course, you've got to be careful, or you'll just muck up the picture). And then you're finished the face. If you had trouble getting the face symmetrical, then maybe you should move on to the quarter views. In my opinion, they're a lot easier...