ok, i've looked it over and as has been mentioned, it could use some colour variation. The legs seem to be the best bet for fixing this, maybe make them a contrasting skin colour like dark blue or purple or something, or even just some wicked-looking tattoos to make it stand out. Another option would be to go absolutely nuts and make them like magma, with a charred, blackened surface with glowing red cracks and whatnot...
OK, after taking a look at the D2 one, seen here
you can see that it has small light tan areas on its pecs and abs. Also, its lower legs seem to have a rougher, dark brown appearance. Note that the wings also seem to have a rough, wrinkly texture... just little contrast things to make it stand out more.
Overall though, it is a nice texture, great job with the face xD