Opinion on a 3D Pre-rendered background...

[Traveler]

CMK2901,

If this is supposed to be a day shot, then your lighting is waaaay off. It's very obvious that you use a single point light, not far from the window outside - it's obvious from the perspective lines produced by the window frame shadows.

I don't know what you use for rendering (didn't read the whole thread, just skimmed it through), but you should consider using a large rectangular light (if your renderer supports it), that emits paralel light rays. It'd be even better to use a Sun lightsource (again, if supported), because that would produce really paralel rays.

Right now it looks like the light is coming from a strong spotlight (maybe a car), about at the level of the horizontal crossbeam of the window frame. You cannot possibly have a shadow from the sun on the ceiling like you have in the image.

Lighting aside, nice image. What do you use for modeling/rendering?

HTH

[CMK2901]

Hey,

I use Blender.  It renders in color and then I put it in greyscale.  I know the lighting is not very realistic, but I think that the correct lighting would look less...dramatic, I guess?  I can agree with the shadows on the ceiling, though; I could probably fix that by slanting the light downward a bit. 

[Traveler]

CMK2901, try using a lightdome instead, if you can. (Be prepared, though, that it'll take a lot longer to render than with a single light source.)

I don't know if Blender supports automatically creating a lightdome, but you can do it manually. (I don't use Blender because I always get upset when I try to find some setting   - for me, it's very counterintuitive.)

I just checked - Sun is there, so you could try with that, too. If you want to set the mood to be dark, put a tree (or something else) in front of the window (outside), to cast shadows. To me (just a personal opinion), the current lighting is very unrealistic. (Unless you have a huge, brightly glowing UFO landing in front of the window, in which case you nailed it.    )