I would make the rocks and wood interact.
Group the rocks closer to each other, but not all of them. Or maybe you have more rocks in the back yard? Maybe larger ones, too.
Then the wood near the rocks.
Then a couple of stones on the far side of the wood.
Do not put the things in there in a symmetrical way, though.
Anubias in not generally planted in the substrate. A very open substrate is OK, but they are more often 'planted' by tying to a rock or branch.