Not half bad. I like the grainy texture on the bars, and the indication of refraction going on in the spheres. One tip, though if youíre trying for photorealism (or a reasonable facsimile thereof): donít make your gradients quite so hard. In other words, on your metal, donít go from stark white to matte black. Pick a fairly light grey (about 5-15% black) and let it fall off to about 50-80%. That will give the impression of ambient light a little more.
Okay, admittedly I’m going to be guilty of tooting my own horn, but have a look at this for some examples of good metallic gradients. Note in particular how the linear gradient is still subject to light falloff in the direction opposite the line of the metal bar. (And if that makes no sense to you whatsoever, let me know and I’ll do my best to explain.)