The eye is great and I do like the composition and color, but it is rather noisy. Not sure if neat image would help or not. I didn't check the dates, but you should have entered one of you cat shots - those are marvelous!
I think dahkotas comment hit it dead on. You have a nice bird and good colors but the noise really takes away from it.A lower ISO setting may have helped but then you wold be giving up some shutter speed. I know that the lighting can be challenging in bird houses.
love these birds, I make it a point to see them every time I go to the Denver zoo(not saying thats where you shot this) I know these birds have lovely colors but this image seems to be too saturated, which also makes the image appear grainy. would love to see the orginal and see if anything could make the color sat better.