Woooow muy imponente! n_n
Is that crokodile is standing in front of a cave or where does the red color in the background come from? Because right know it'r really hard to tell. If there is a red light source in the background, or red stones or something of the like, than the light should also fall onto the crocodrile. That would help to give the picture some depth. Right now it's kind of hard to tell what the picture is showing. Which is kind of nice too, but I'm not sure whether that is what you intended here.
Oh, gosh.... So much detail! I have no words for this piece...