Nice clean lines!
His pose seems pretty stiff. His hand's too small. His legs are different lengths. The crotch of his pants are too high (remember, it's be uncomfortable if your pants rode into your crotch, huh). Since, his sleeve is completely pulled across his chest, there should be a lot more folds and creases on the coat. His eyes are a little too far apart and the irises are different sizes. The ears are different sizes and may be a tad bit too low., His mouth may be a bit too low, as well. The indent of his hair shouldn't go so deep (it cuts into his head).