For now. Only because I can't think of anything else. But I will.
Here's the new and improved look from my kitchen window. In all, I reseated the black edging, moved a couple rocks, moved a bunch of plants, and threw down 11 bags of mulch (3 cubic feet each).
I made it about "this much" smaller on three sides - mostly so there's less maintenance, and to create more room for the kids' swingset (next project!).
This is the big rock I moved. All leverage baby. Since my arms are X long and my ass is Y wide, I can move things Z heavy. Plus, it was mostly down slope.
This is the rock I didn't move. Tried though, but just a little too big. Looking to put some tall grass in behind this little arrangement, but will wait until it goes on sale in just a few weeks.