Hardscape advice for a somewhat unique tank style
The tank I'm starting to build is a little unique, kind of inspired by the moss biotopes made by muchikusa on YouTube. The tank itself is a 15in diameter, 4 in deep glass cylinder vase, around 3.5 gallons total. The vision is to have a lava rock outcropping covered in moss, emersed plants, and a small trickle "waterfall", plus some immersed plants like small bucelphilandra and some kind of tiny grass in patches. All on a white sand substrate. I haven't decided if I'll add livestock, but if I do it'll just be cherry shrimp and snails.
I have around 15 pounds of lava rock, with 2 big chunks and the rest being ~3in pieces. Eventually, I'll use a rock dust/silicone paste to fill in gaps between the smaller rocks. Until then, I'm trying to find a layout that feels cohesive in a mocked up cardboard tank, but I'm struggling to find something I like. Pictured is my best attempt so far. One of the large chunks has a recess that I think could make a cool "pool" at the top of the waterfall, but that's about the only idea I have right now.
Anyone have any suggestions for how to lay out this hardscape better? Or I guess more generally, I'd be interested in better learning guidelines for creating flow with hardscape in a round tank like this.