So I am by no means a great aquascaper, especially when it comes to rock as I've only personally done wood.
I really like your petrified wood, definitely some cool rock. With the rock in each grouping angled in on each side, like /\ /\, I feel like you lose the contrast between pieces on the same sides. I'd personally be tempted to pick and angle for each side and stick with it, like / / \ \. I think this would help the individual pieces of rock from blending into each other and kind of getting lost as individual pieces.
I like the look of the light hanging above the tank! My Mr. Aqua 17 is underneath a finnex fugeray which is laying on the rim. Now you have me thinking about adding a hanging setup for my light.
I also can't wait to see how the planted+ works for you. I'm debating about jumping to that light.
I really like the look of suspended lights as well. I made a pretty sleek looking set up for the light over my 20L. Took some lightweight coated SS fishing leader and swivels. Looks clean and barely visible.