Galactic Cardboard

I need your help! I’ve come up 3 ways to frame these new pieces, but can’t decide which I like best.

1. Boxed: this design highlights the natural curve of the background, while still allowing it to hang flat on the wall.
2. Framed: this one uses a frame that sits higher than most of the piece. It sort of “contains” the work.
3. Floating: this design maintains the natural curve, but allows you see the raw edge of the piece.

Which framing do you prefer?

Finished the base painting on my next piece. Not super happy with the green through the middle, so need to find a way to lighten it up.