Since you asked for my opinion Solstice, I'll try to give the best advice I can.
The right side is definitely more in keeping with a typical rock lay out. Based on the plant choices, it looks like you are doing something similar to an iwagumi. The purposeful slope also makes me think you might have been influenced by Filipe Oliviera (spelling?) who is a good aquascaper as well.
The left side, with its more sparsely layed out rocks is interestng. At a gut reaction level, I tended to prefer the consistency of the right side but I'm not quite sure where you are going with this so I can't really made a guess.
For more visual interest, I'd consider sloping the substrate front to back in addition to the already obvious middle sloe. Having more levels will help you create depth/visual complexity.
Hope that helps
