There are some photos that can not be adequately critiqued, this is one of them. You captured a likely once in a lifetime shot, and you did it well, you should take pride in that alone. Any time I have attempted to photograph a rainbow, it is gone before the lens cap comes off, or I can not get the color right. You captured two flawlessly.
I do like how the picture is at the angle that it is. It gives is a sort of surreal sense, in stead of just, "Oh look, there is a double rainbow." It is almost as if the viewer is in flight. The use of the angle also helps to place both rainbows at ideal focal point in the frame.