$imon:  Sorry mate, I hadn't spotted your post above 'til now.  You are quite right about the gold... in my efforts to get the shadow working I neglected a few other points!  A much higher Rough value, to reduce the roughness, would have been preferrable.  I can't think of another method to produce a shadow in ART that incorporates a "light-thru-lens" or caustic effect, other than baked shadows (or heavy 2D editing).  I think the concept could work ok, but needs some tweaking and careful planning to work well.  The lens fitment is a bit of a problem.  I based these glasses on my own, and the lenses do actually extend back beyond the frame about half a millimetre or so, because the lenses are thicker towards the outside than the inside, thicker than the thickness of the frame itself.  I should have put a bevel to the back edge of the lens to make it less obvious... moving away from strict reality for the sake of a better looking image.
Indian8or:  I agree, the background is quite blurry (intentional towards the back, unfortunate towards the front).  The fault is entirely my own, not Anim8or's, as the texture used in the ambient/diffuse and bump channels is relatively low res.
captaindrewi:  There aint no masters here mate, just Anim8or afficionados, and I would rate your CC as highly as anybody's.  I agree about my floor, I would have loved to have re-worked it but there just wasn't time unfortunately.
onespirit5777:  The impression of heaviness is a good thing, like an expensive bit of bling.  It's a great design, and I wouldn't mind a pair of them myself!