I've done a few concept paint overs, done over photos that I took from parts of the Queen's building.
I tried to show how I pictured the webs and cocoons to look. I wanted them to be quite thick and dense, rather than thin and spindly. I think doing them in this way will make modelling and texturing them easier.
This is a quick mockup in 3DsMax to show one of the corriders.
I then used it to do two quick paintovers.