First Picture:
Maya raytrace renderer; Bumpmap is here, "going outwards". One dir-light which has a 1.5 deg light angle for smooth shadow-border. And three spotlights with diffuse and specular only, without shadow-casting.

Second Picture;
Mental ray; with no enabled lights. There are lights which are hidden, but that's just to get rid of the default lights. The light source is a surrounding nurbs-surface with hdri map as incandescence. The bumpmap is here "going inwards".

Default Production mode
With 10 000 Final Gather rays
Minrad = 0 (auto)
Maxrad = 0 (auto)

Min/Max Sampling = 2 and 2

Rendering time = around two hours with PIII, 600 Mhz, 384 MB SDRAM

Third picture; A mental ray, raytrace. It looks a little different than the "maya render", but I admit to having altering it. This rendering is not "optimal in any major way", its just a simple mental ray rendering.