Very nice. I particularly like how the driftwood at the right forms a ‘window’ to look through. I like the rock on the driftwood. I don’t think it looks so unnatural, depends on what you’ve seen. At the cottage, when we go for our miles-long walks, the shoreline turns from marshy, to sandy, to rocky at various points and I like to observe the mixing of general lake “stuff” to see what nature does and get ideas. The intermingling of sand, stones, seaweed (well, I’ll leave that out of my aquarium), driftwood (just smaller pieces, mind you), clam shells, dead fish (leave those out, too) etc. etc. is quite fascinating, sometimes defying all logic, i.e. totally smooth sandy area with 1 rock stuck in the middle.
My only suggestion is a background to hide those cords on the side.