Very nice Paul – you’ve caught the rainbow well and composed it nicely to align with the rock. Well saturated too.
Only very minor issue I see is it would have been good to get a bit more space between the bottom of the island and the top of the rocks in the mid-ground. At the moment if gives the impression of sharpening halos (which I don’t think it is.)
Did the rainbow go any further? Do you have any wider angle shots?
Good shot and great colours. It would have been nicer I think to include the curve of the rainbow as it looks a bit out of place and intruding into the frame.
Cheers, Dee