The model looks really good. The problem I see is with the background scene. The grass mat is too shiny and has no visible bump, so it's a bit unrealistic. Then, it seems that you have a different ambient color for the trees: in the most visible one it's almost black, and in the background one (the one behind the model) is somewhat greyish (to set the same color, Ctrl-click on the ambient color picker of the mat and you'll be able to insert precise RGB values). Then again, the farthest tree has to be "lowered" into the ground to avoid the roots showing (this is a Bryce problem, the roots are very un-realistic). This is what I noticed. A sidenote: the model seems more apt to move itself on sand/rocks, so maybe you can try another kind of ground mat. A desert-ish one could also match better the beautiful mimetic texture you used on the model. Just my 2 eurocents. :) Stefano