Why are his arms long enough for his hands to be hitting his knees? Why is his elbow at his waste? Why is there no curve on the inside of his shoes? Why do his feet appear to be standing on two different platforms? Why does his right hand have five fingers but no thu-- ah I see, you just drew the joints incorrectly, so it appears as though what's supposed to be his thumb is actually a fifth finger.
It's transparently clear that your grasp on anatomy just doesn't exist.