Quote - Do you think it's just in the textures or do the meshes have a higher polygon count too?

Yep, I think it's 'in the textures' and the 'render settings.' The polygon count I doubt is an issue as Vue can do procedural terrains, and Terragen 0.9 can't. Furthermore, IMO, the mode of creating a scene in Terragen (look around) effectively obfuscates the majority of the polys in a terrain.

Quote - Your image has a little fog or haze which pushes the distant hills further back, while the top one looks somewhat flatter without the fog. What if you turn the fog to "0" so the front terrains are more clear and add more haze to keep the distant land so it looks further back. Just a thought. Overall a Very Realistic image! :)

LMcLean, good find. Actually there is really no fog/haze effect on the terrain on the left. The mat for the rear terrain was so poor, I decided to move it back a bit and use a little fog to create a sense of distance. I'll try and fix than in upcoming renderings. Stay tuned ;-)