Nice rainbow. Compositionally, it's a good use of the rule of thirds. Technically, though, the top of the clouds are completely blown out, and the colors on the ground are a bit strange. So overall, a mixed bag.
I like that you caught a natural rainbow, but the colors on the rest of the image seem a bit heavy on the yellow side. A little more work on the colors of the landscape would have left you with a stronger image IMHO.
Nice work to capture a real life rainbow with such a great sky behind it. You did a nice job of framing it by the trees - but I really think this could have used a boost in colors around the rainbow to really bring it out.
Nice image and it exudes a nice warm feeling.i like the depth in this. The 2nd and the 3rd small shrub in front are a little out of place as the first one is syncronised with the rainbow