This piece is real nice, I like the way the colours are a little less vibrant which, well this is how i think of it, shows you it's a vector from the original star wars trilogy instead of the newest ones, ep I, II, III
I really love the dusty earth-toned color pallate. It fits the series quite well.
But you are right, something is off. I think his legs are too skinny. And if I remember correctly, I don't think that the rocket sticking out of the back of his backpack was that tall, it should be lower than the top of his head.