Very nice post and I am glad that you are in the part of my neck of the woods that produces this type of image..You asked for critiques and I would say that if you have access to PS or some other grain eliminator it might work well here to bring out the rainbow..

Nicely composed and lucky you...I'm under a cloud cover up here in the North Country.

:)PJ

I like that you've used the trees to frame the shot, but there might be a little too much of them there. If you were a little tighter, my eye would focus more on the rainbow and wander less on the trees. Still a nice capture, thanks for sharing.

"LUCK" works real well in capturing a Rainbow. :-)

This is a real nice capture.

Great shot, well cone :-)