IMO...the concepts mouth/nose is a bit screwed up =\...it looks like a mixture of a rabbit or kangaroo (the /nose) a tiger (the body texture) and a dinosaur (the tail) and...well...the rabbit/kangaroo nose doesnt really fit in...also i think if you want it to look more dangerous, you should change the mouth a bit, it should have some teeth sticking out like a crocodile
but i agree, dont use the same skin texture as the concept
i would go more with a green (not light but not too dark either) skin and the stripes should be dark brown/red...blue would also fit but not as nice as brown or red IMO