Yeah, i hear you on the aesthetics issue. Both this and the other map are ones I threw together just this morning and afternoon out of boredom. As such, I haven't added all the doodads and decorations that will be there later. I like to make the map terrain/balance first and then slowly add doodads over time to decorate the map as I see fit. The most important thing to me is map design and balance. Aesthetics are something I add in after I feel good about the balance issues of the map. Part of the reason for this is because if I;m going to change the terrain drastically, then I'll have to erase doodads and decorations when I do it, and that just feels like work thrown out the window.
So yeah, I'll be decorating both these maps overtime. For an idea of how I tend to decorate my maps, check out my other map, Withering Ridge:
Regarding the little islands suggestion. i like your idea. Unfortunately to make that work I'd have to raise them to level 2, and the plateau itself is level 1. I'm hesitant to do that as it would make for some odd aesthetics, but more importantly it would allow for tank-drop or reaper harass in the main.