Very nice! You're off to a good start. I like the clean look of the white sand and the dark colors of the wood and the rocks give some good contrast. You chose some nice fish too.
Here's my suggestions, FWIW:
- Adding some similarly-shaped driftwood on the left side would look nice, and you could place another rock in front of it.
- I wouldn't cover the driftwood completely in moss, but maybe just in some parts? Some fissidens or taiwan moss would look nice, or maybe even weeping moss. You have a lot of options.
- Level out the sand. The "wavy" look is a little distracting.
- If you're looking for a tall background plant, i think Blyxa aubertii
would be a good option. They grow very tall and are relatively easy to keep. They're somewhat hard to find but i'm sure someone on the SNS would be willing to sell you a few plants. You could put a few of them behind the driftwood/rocks.
I'm excited to see where you go with this tank. Subscribed!