What an amazing build!!! It says nothing but fun all over the place!! All the rock work reminds me of an old world castle full of mystery and intrigue. I don't know as much as Kim says. Bmore and Helen are super landscapers and gardeners. Be sure to check out their builds. But I always have an opinion and happy to share what I do know. Keep in mind, most of what I say is opinion and not based on knowledge.
Thanks for your terrific photos with the circles around what you like in each. I love that! What kind of a look are you going for - tropical or arid or a combination? Palms seem to go either way. It might be easier to go with a tropical look for the Baton Rouge area. I do want to pass on what I just learned last week - sago palms are very poisonous to dogs and cats. Here's a quick quote from a Google page: "Sago Palm and Dogs - Sago Palm Poisonous to Dogs and Cats
Sago Palm and Dogs - Sago Palm Poisonous to Dogs and Cats All parts of sago palm are considered poisonous, with the seeds (nuts) being the most toxic part of the plant. Sago palm contains cycasin, which is the primary active toxic agent resulting in severe liver failure in dogs." I don't know anything about palms, so I can't say if there are any sagos in your inspiration pictures. It's important to check out all of the plants you select to make sure they won't pose a danger to Cochise.
I love Bmore's idea of using ornamental grasses to spill over the deck or rocks. There are some gorgeous ones with beautiful, subtle colors. Check that they don't have a lot of seeds or 'blowy stuff' to be a headache in the pool. Marla brought up a good point about agapanthus blooming only once a year. It's a decent blooming period, but when it's over, it's over. I used to not like them because of that. Now I love them for their lush green blades that you see year round. They can fill in an area beautifully, and they aren't invasive or messy. Mine are right next to the pool, and the blooms haven't been a problem.
I can't help at all with the cedars or junipers. To each his own - I've never liked them. It doesn't help my opinion that I'm very allergic to cedars and junipers. (sneezing now as I think about it!) But the junipers you show above would look nice growing in and around the rocks. Being a low growing plant, they would show well on the hillside. To me they don't have a very tropical look.
I haven't read all of your thread, so I don't know if you guys enjoy gardening and taking care of plants. If you have your own yard/plant maintenance guys, then there's no limit to what you can plant. Otherwise, pick plants that will be fairly easy to maintain especially in any hard to reach areas. Sorry if you know all these things, but I don't know what you know! And some landscapers will steer you to what is available now, not necessarily what you want or low maintenace. I love to have things blooming all year, so I usually shop each season and see what the nurseries have in bloom. That gives me a better chance that it will bloom in my garden. For me, gardens are a building process, but I LOVE shopping for plants. In the beginning, you may not want to fill every square inch if you like the idea of filling in and planting with the blooming seasonal plants. I used to love my annuals, because of their gorgeous colors. As I get creakier with age, I've moved to the perennials. I don't have to replace them and they're usually hardier, too. Some annuals behave as perennials in our climate - allysum, verbena, impatiens (in a mild winter), etc. You'll have even better luck in Baton Rouge.
If you're going for a more arid look, I'm not any help there. For tropical, here are some plants I like: bougainvillea, hibiscus, many of the butterfly-attracting plants, lantana ever-blooming day lillies. Now I'm drawing a blank and I'm out of time. I'll get back to you - I know I know more than those! Lol!!!!
If you need more help, let us know the look you're going for. I might be able to help better that way.
Take care,
Suz