Great jungle scene, Seth. I can understand Martin's suggestion for background foliage-covered peaks, but (a) I don't think your computer would be too happy to accept the extended pop coverage (a rough procedural displacement on the distant peaks to simulate a tree outline might be a solution your machine would accept), and (b) as the mist is so dense those distant peaks wouldn't be that visible anyway.
Get Martin to imagine a wide Amazonian basin beyond that mid-distance fringe, and the background peaks so far a way they just aren't visible
John
