Given that the quilt depicts a campfire, with sparks rising into the night sky, consider some free motion quilting. It would make sense to quilt flame shapes in the fire piecing (the warm colours), and maybe stars or galaxy shapes in the darker background.
You can sketch it out on a printout of your quilt photo, then practice on quilt sandwiches.
And I agree that quilting with the colours matching what you are quilting on would look great.