Whew, LOVED how your path in the gravel turned out! And starting off with the background, top notch!
The only suggestions I would make is that I felt the gravel decor and beauty is a bit smothered by all of the rocks and (colored glass?) sitting on top of it - to be honest, I liked it a little plainer, but it's great. The only issue is, I think you may find it a food/pooh trap. I had my 16g with pebble sized gravel and flat smooth rocks, and the ammonia would climb and climb despite every other day water changes. (And all I had was one dwarf gourami, 3 tiny neons, and 2 even smaller Otos barely out of fry stage, not a big bioload.) Would would happen is the food would sometimes fall inbetween the rocks, and the fish weren't able to pick at it and find it, and it would just fungus and build up, along with the waste. I know the plants will help some, just something to think about.
Can't wait to see more!