Remember that a lot of lights are missing from that render. Anywhere that the player will be will be well lit- the base platforms, the lower land bridge, etc. I'm contemplating ideas for making the canyon more interesting/well lit, but it all depends on how many free polies I have after the new restructuring. I also have to try to estimate how much tag space the custom lightmaps are going to take up.

And as for the mockup, here it be: