I think this is a wonderful picture! I wanted to see a rainbow the whole time we were there this summer, and never saw one. Lucky you. You captured it well.
Actually it's quite impressive. Both of your falls shots have been. I love how this rainbow ends at the rock. I have to ask if you were equally fortunate to get some great night shots of the beautiful lit falls? This one I'll take to my favs. I think it's pretty unique.
It isn't just the water and the beautiful rainbow... it's the birds (seaguls?) on the grassy rock! Who's going to bother them there?! Do they too enjoy the view? Since they seem to be at the end of the rainbow, are they looking for their pot of gold?
"It is not a great picture?" Then, what would you call "a great picture", if I may ask? This is awsome. I'm jeolous. It looks better than all Niagara pics I've posted >:(
It's an amazing catch. Be proud my friend...