The ears go off at different angles.
His left arm obscures the single non-head spike you chose to draw, making it look like all his spikes are on his head.
Gloves are affected by gravity - typically, they will rest on your arm, not float around it.
The middle finger of his left hand goes off to the side at an almost 90 degree angle. I tried to do that. I failed miserably. It must be painful.
The top curved edges of his brown front do not look like they are the same. The one on the left seems to come out of his leg or something instead of looking realistic.
Exactly what is he doing? I'm no gymnast, but I can see no reason to actually hold your left leg like that in normal movement, especially when the foot seems to be over the other foot.
...and, you know, CAN you hold your left leg like that? It seems to be coming up out of his body. Most legs start off going down.
I honestly can not figure out the perspective on his right arm/hand or which way it's going.