We use black egg crate at Koral king
We think that taking pictures with blue lights and orange lenses is all good as long as the seller is up front about what they are using. No one likes edited photos (which are just flat out wrong)
I think coral vendors should do sort of what @Tidal Gardens does and have multiple pictures of the same coral under different spectrums so we can get a feel of what the coral ACTUALLY looks like.
Side shots would be nice too.... everyone should know by now that the best color shots come from directly above. I generally view my tank from the side at eye level.