This has a nice colored tone to it overall, and I like the shapes created by the reeds and water. The rainbow seems too understated to be really effective in the overall composition though - unless that's what you intended by calling it "searching"?
Interesting use of colour. However, the rainbow is definitely *not* the subject in this image, as your title implies. This perhaps could have been post-processed to better emphasize the rainbow (or better yet, pre-processed to bring out that colour).
Ignoring the rainbow, the landscape itself is very nice.
Interesting idea. The rainbow is almost too subtle to be effective though. Perhaps using spot editing, upping the saturation on the rainbow would enhance the effect you were going for, (JMO).
hmm. I do like this. It's cool because you can only barely see the rainbow and it forces you to really look at the picture. However, my attention was at the object in the water and could have easily not seen the rainbow. Maybe try to have something draw the viewer's attention even further to the sky.
Tones are very harsh here and the scene seems generally overexposed. On my monitor the rainbow is barely visible; first impression was that the sky was just blown out.
i really like the composition, clarity, and use of sepia - I mean I really like it (would have given it at least an 8 or 9), but I really don't like the rainbow in this image - it seems very contrived. All in all, 6