As X-boy said, the forehead is too long/big, also, his forearms...even for dbz proportions are way WAY too short, they look to be about the size of his hand, when I'm pretty sure the typical forearm is a bit longer than our bicep area.
To a lesser extent the legs/thighs have the same problem, the thighs are too long, so the calves/lower leg looks too short.
His normal hair looks good, but his ssj hair has too few spikes, it looks like he lost the back half of his hair. The pony tail at the back should be sticking out more straight as well.
And to recycle what Ravendust said, he's way too buff, he should be skinnier specifically the arms and torso, he should have more of a V shape. His shoulders can stay the same size though, since those are huge even when he's not USSJ as seen in
http://www.myfavoritegames.com/detail.aspx?i=Trunks/trunksssjcrossingarms.jpg