Based on what you captured this is a very nice shot. I know that sometimes you have little time to react before things change and magic moments disappear. So…lets start out with a congrats on a wonderful capture.
With that in mind…let’s split some hairs.
The light captured is pretty darned good. It seems a little…um…non dynamic. Did you slightly under expose this and bring the exposure back up? That sometimes flattens out the light a smidge.
Colors are pretty darned good…nice yellowish slight hue like later light…the sky is a pleasant blue…the clouds reflect accurate grays and whites.
Composition….this is where that wonderful time factor comes in….I don’t know how much time you had…if you had a vehicle…etc. If you had both….I would have taken this shot….but then I would have moved to the right in this picture to see if I could get the beginning of the rainbows arc a little more to the left…..with the rock centered….and cropped it a little tighter…
If I knew that where I was ended up being a fleeting moment…after getting this shot, I would have also tried a little longer lens and getting a tighter crop on just the lower part of the rainbow and some detail of the red rocks.
As it sits…it is a great picture of a wonderful moment…but the composition is just a little weighted to the right is all.
Nice work George!!!
Roman