This is a fantastic drawing of Goku. Almost everything is spot on from the hair to the uniform and so on. I just wish that you drew his eyes Anime style like they should be. The way you drew his eyes still looks good, but it's just not the same, you know?
In a way, I wish you didn't go with such a pale skin color, but in another way it still looks okay to me, so I won't lower the score for that.
Also, his ring finger is awkward looking because the knuckle looks like a bump on his hand. Then his left pinky doesn't have a knuckle at all. More attention should've been paid to his left hand.
It's really just a couple of little things that hurt this drawing. Nonetheless, it's still pretty well done and you are very talented.