seriously? that's your second one? wow. well, as some one else said, the only problem would be one of the ears way to short, but i guess that's supposed to be like that to be like the sneasel ear.
the second one, where the armour plating is over it's head, the outline looks wierd. it goes right up, then suddenly spikey... i don't know how to explain, actually... uh... *thinks* well, just where it meets the dark grey part, it needs to be more curved. and the '0' furthest away from us looks a bit too big, it's touching the armour.
hope that helps!