IronHawk, just a quick crit, rocks would not be piled up that close to any hand rail or covering of the enforced rock wall, but it looks great besides that small nearly moot point.
Are those rocks? (just checking they arent some alien forms or something, not a knock against your work) If they are, perhaps try pinching the edges more so they look nice and sharp and rock like?
virtuosic, thats really nice, one thing that stuck out to me was the blend between the rock and the sand, thought it might look better if it went from rock-stones-sand, but its ace anyway