Welcome to TPT! It's hard to tell without the Manzanita in place. Once it's saturated and down it'll be way easier to critique. You may find you need to cut a few inches off the back end, or it may be perfect the way it is, etc.
From a function standpoint, I like to have enough space between hardscape and glass (front and sides at least) to comfortably get an algae scraper/ pad in there. May be a little tight on the right side glass. Another thing to consider is what kind of plants are you planning? Taller plants behind the rocks or rhizome plants attached to the hardscape or carpeting plants in the foreground, or all 3? Also, opinions vary of course, but I think having a solid color background (usually black) is one little thing that makes a big difference in most tanks. Good luck, I like the looks of the materials you're starting with
92% of all statistics are made up on the spot.