I think I'm calling this one done ... finally. This was a 55 hour render due to the complexity of the terrain materials, the water materials, the procedural terrain and the spectral sky. The terrain has a custom underlaying material and uses a new function to create the look. The ecosystem is also custom. The water plane has been wavemapped and I tweaked the colors to make it more of a match to the waterfall and rapids. The sky is a custom atmosphere which uses Global Ambience for the lighting model. I changed the position of the sun slightly to soften the shadows under the vegetation. Thanks for looking and thanks for all the comments during the evolution of this image.