Great rock placing although the grass looks a little like a comb over...lol...
I can't argue with that, I kind of like it though. It's swept over like that because of the flow, I've tried adjusting it but it looks a bit static just sticking straight up.
Your not tempted to plant it further? Not even a little bit...
I've got some more moss growing on mesh around the back of the rocks that I'll use it once it's grown over the metal, other than that, no. I'm quite enjoying the 'stark' look!