Mwesch, this is a really hard scene indeed, if you want the opinion of one who has been playing with Indigo/SkIndigo for a while.. It is really wide, and you see lots of stuff around! This will "complicate" the rendering phase, obviously. A scene, to be realistic, has to be full of small details, and if the scene is wide you have to put a lot of them in. First thing I can recall is BEVELING. Almost every object has beveled edges, so I suggest you download a great ruby plugin from the Sketchucation forums (
http://forums.sketchucation.com/viewtop ... &sk=t&sd=a) and apply it to your nearest objects.
Second thing is texturing: always use good texture for extensive surfaces: the floor is good because you have a good texture aplpied to it. Try to use only partially saturated textures: too much saturation pushes down realism a lot.
Third thing is contrast: try to play a little with the levels of the sun an the sky, changing their default value of 1. Then, try to play a little with the camera response functions.
These are my tips. I really think this is already something to be proud of, by the way. Make some subtle changes, add small details, let it cook longer and you'll have a masterpiece. Oh, the two points perspective idea is really good, but remember that the default SU 2 points perspective isn't supported (as far as I know) by SkIndigo. You have to download cameraparameters.rb from smustard (free) and input the same z value in both camera and target fields.