I've found some omnibus pictures as well. I think they are fantastic.
Most of the pictures I found where small so they aren't so sharp when blown up. They do show a number of important details like the driver's blanket, where the advertisements where placed and the scale of the bus. I can't wait to get one of the West Wind omnibuses now. It will be a major project for me though. I'd have to acquire a bunch of seated passengers. I'd feel the need to place passengers seated at the windows of the bus and a number on top. I love the crowed look to the bus in the sepia tone picture.