I would personally prefer a cactus themed surface for the retaining wall. I would also something relative and cozy for our eye level garden. The grass needs to be lifted so we can see what soil is preventing it from growing. There after I would like it leveled and seeds sewn. I would also like an irrigation system. My presence with medium plants is to have them potted. I do have ideas and am willing to collaborate. I would also like you to take a look at the dog sleeping area, and find a solution to the clutter and give them a nice living area.