i've ditched the single light and gone back to the multiple light setup.

the light on the A was a bit brighter than i planned, but i kind of like it.
The highlight is a bit bright (clear white) as it fades to background color a bit to fast. Either add a soft backlight with pale blue (opacity <15) or put a foamfilter around the white. Is it a directional spotlight you've put there? If so, try using a radial light to smooth out the edges it creates.