Blender 2.5, Internal engine.
cool concept! but way toe much chromatic aberration, and a menacing pose would be more suitable.
but overall great work, love the modeling! 
Thanks :).
I like it, both the concept and execution. The dispersion works in this context with the textures and the semi-abstract design. The only thing I might do is tweak the lighting or rock/sand texture to give the turtle head a bit more visual separation from the background.