I've avoided offering suggestions for a couple of reasons: first, because of the concrete borders you've already installed. My gut reaction is that if those spaces are planted in a typical way, instead of being an asset they would be a detriment to the overall appearance of the house and property. What compounds this and makes it worse is that one section of the walk is so darned skinny and the turn toward the house is so sharp! it cheapens the overall look of the house and should have been fixed before the borders were added. Second, while you've got a lot of pictures, the information they provide is limited, as the pictures are from all different points of view. What's missing is showing the whole scene from the most important -- front and center -- point of view. The second-from-last picture attempts to do this but it is incomplete and from too great a distance. Hate to be so picky about the pictures but they are what makes the property understandable to us and one of the best vehicles for us to convey suggestions back to you.

I suppose the most probable fix is to do a foundation planting based on what the house needs (temporarily ignoring the bordered areas) and then plant primarily low groundcover in the bordered areas. (I would definitely consider perennial peanut for them since you are in Miami.)

If you want help for how I think you should arrange a foundation planting, you would need to position the camera in line with the center of the house and midway between house and city sidewalk. It would stay in that position for all pictures, but pivot The series of pictures would span 180*. Begin by aiming far left, and finish aiming far right. We would see neighbor's properties at the beginning and end of the span, and your property at the center. If you look at some other threads, you will probably find examples of such pictures. They can be put back together to show the scene almost as if we were standing there seeing it for ourselves.

Also, you might mention if you have any overall goals that are beyond the typical.