I agree that what you have looks just fine. For a panel with only one joint, especially that short, I don't even use cauls. I just start at one end and align at the first clamp as I tighten it. Then, work my way to the other end, aligning and tightening as I go. After about an hour, I'll release the clamps and shave off the glue squeeze-out with an old chisel while it's still soft. A little extra attention at the joint line with the sander, and you're good to go.
“We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore.” - Mark Twain