I think this is an amazing piece of art. The shading on his body is perfect and balances out nicely to show off the shape and swell of his muscles. The colors are vibrant and work very well as well, even the background color. Plus you can tell who it is automatically because of the striking resemblance. I love how the spots of white also help with the shading and give the piece even more character as well. I love this piece, keep up the good work and I cant wait to see what you decide to work on next.
The perspective on this is quite excellent! You have captured a difficult pose very well. It really does look like there is a camera above Goku's head and he is looking up at it, so well done. The shading on the piece is nice as well, particularly the detail on the neck muscles. The creases in the fabric of his gi are great and I like how the darker orange shading gives them emphasis. The only major flaw in the piece is his hand, the lines which represent the knuckles are too long, which makes the hand look a bit fat and more like a paw, and tends to make the arm look a bit short for his body as well in this perspective. Other than that though you have done a wonderful job, the colours are bright and posing well executed. Well done!