Hi there Blinn
great Work, I love it : DroooooooooL :
for the colors scheme, why don't you use a brown for the back and a lighter brown for the trunk, also I think it'd look great if you added some webbed wings under his arms, little tiny wings, remember the dinsoaur that could spread it's head sides in Jurassic Park-Part 1- kinda look like that, would give it a scarier look.
Just my 0.02 $ 
keep up the awesome work
I don't suffer from stress, I'm a carrier.