Ah now I understand why you lost some details.. it's normal maps not displacement...
But this is much better in my opinion.

I would tune down the contrast of the stone details a little more so that the lizard is in focus... and would apply a subtle DOF to the model.

Btw is it me or something is wrong with shadows... especially from the tail..

_________________
Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand

Thanks for the comments.

I checked the shadows in the grey render.
They're blending with the color of the stone texture.

Here's another render: (with some minor changes in filling up the scales in earlier vacant areas)

iguana_new.jpg 221.91 KB Views: 163 Description:

good

What if you will make the stone not so dark?
_________________
Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand