Quite nice, in my opinion you can paint the different walls with different colour brightnesses, so to make the image look less "flat" (as you included some gradient colours already, so you're not going for those simple flat colour style I think, so you can add more dynamics to the colour brightnesses).
Also, you don't really need to scale the picture up before posting (which boosted up filesize a bit), you can just use the forum tag codes to resize the picture automatically
, example:
[ img width=640 height=400]http://.....[ /img]
remove the spaces after [ of course.
Also, you don't really need to scale the picture up before posting (which boosted up filesize a bit), you can just use the forum tag codes to resize the picture automatically

[ img width=640 height=400]http://.....[ /img]
remove the spaces after [ of course.