Lovely just as is, these suggestions are necessarily an improvement, simply my taste. Since you asked for suggestions , here goes.

I would crop about 10% off the right side.

I would also mildly reduce the magenta tone. I do calibrate my monitor, including recently. On my screen the magenta tone of the distant features and the bottom edge of the rainbow seems beyond natural.

I know many other members also use calibrated screens, so if this is a quirk of my monitor, then forget the second comment.