The models look good, but it seems u haven´t connect the head right on their neck...
And u make the biceps completly wrong.
If i looked exactly at the arms, much more than the biceps are wrong... u forgott to give them muscular shoulders... It looks like Goku/ Gohan haves mega (but "WRONG") Biceps and little, little, little weak shoulder- muscels....
Try to fix their connection between their head and their neck (if it is wrong, because it looks wrong : /) and try to fix their arms! (if the connection between head and neck IS wrong, u will have big trouble to fix it...)
And the slit on the pants looked a bit to big...