Cool, just a couple of points though I'm no dino expert so I may be wrong.

The 'neck' area looks wrong like it sags, i would have thought it would be more wrought, and stretched down the spine.

IT looks like hes giving more of a pityful cough rather than a screaming roar at the minute, think its because the edges where the 'lips meet are not back and high enough.

Apart from that, it would look very cool when you texture it!