This is good work. The grass is very well done. A few more suggestions for improvement: Make use of soft shadows (assuming Bryce5). If you turn the Bryce sun off and replace it with a parallel light, you can vary the amount of softness to taste. The contrast of the 3D scene is much greater than the background pic. At the mid-ground (dumpster, barrels, fence, etc) the shadows and non-direct-lit surfaces should only be completely dark in the tightest of corners. Related to that, note that the shadows cast on the pipes and ground are much darker than those cast on the white wall. Even allowing for the whiteness of the wall, the difference is noticeable.