What I would like to see for promo renders are:

1. Neutral lighting -- all lights white. (Except for things which come with lights.) This is especially important when looking at figure textures. My prefered setup when I'm trying to compare different skin textures, morphs, whatever during character development (for my own purposes) is typically a pure white IBL with AO at about 30%, and an infinite white light coming from above and to one side at about 80%.
2. Figures should be shown in front view, profile, and 3/4 view.
3. Outside products should be listed. (If nothing else, so that I know what they are so I can buy them if they look really cool. :))