Farmer's idea works for me. The problem was teh two sides - equally interesting on their own - did not relate to each other. Farmer's manipulation fixes that by bringing the rocks as subservient elements to the big and awesome piece of wood. If you still want a mountain like element, it might go where the big wood hits the substrate. Maybe.
I must admit that seeing it planted it looks better. can you put some stem plants on the far left? I think that would be great. Maybe you could also put one of those more red plants you have on the right in that focal point on the left.