It looks good but there is something wrong with the lighting. Look at the background. It is lit by the sun plus some ambient light (sunlight reflecting off the ground and sky). Your model looks like it is being lit evenly from all directions plus a spotlight on his back. Think about the angle of the sun and how it would illuminate the raptor. It would be hot on his back but would cause shadows on much of his skin that is not being directly hit by the light. Look at the rocks or cactus in the background. See how shadowy they are. That's because the sun is a single light source (directional) plus, since there isn't much cloud coverage, the sunlight is not being diffused (scattered).

One other thing; the background is much softer than the raptor. The raptor is too sharp. You can fix this by applying a small amount of blur to the model if you are compositing with a program such as After Effects.

Nice looking model