nice use of rich colors in this image - i like how the 'rainbow' theme is maintained through the curved line. The things that bother me a bit are crispness of focus around the image -especially at the edge of the bubble - and the cropping - it seems that the image is closed down too much with the horizontal placement. A more squared crop might open it up a bit more.
This one doesn't do much for me. As an abstract it doesnt really grab my attention. Nice colors and it fits the challenge for sure, but not a whole lot to keep me here wanting to look at it more.