Aaah that is definitely looking better! 
Now, what you need to do to give it a more natural look, is to make the spikes uneven - don’t have them all the same length and facing outwards at the same angles - this is a creature of the wild, so make it all uneven and wild and jagged!
Make some of the spikes much longer, make some of them bent, make one or two missing here and there. 
Also, for the mouthpiece, perhaps you could add more teeth and stuff. Remember the saarlac in Return Of The Jedi? That giant worm thing with all the teeth in the desert that Jabba wanted to chuck Luke into? Well, perhaps you could do something like that for the mouth and gullet - rows and rows of tusk-like teeth, that would make him look very vicious indeed! 
You also need mould those front teeth slightly, because it looks like those polys are under a bit of strain.
Keep going :buttrock: