You caught the perfect pose here, and left just the right amount of motion blur. While a tighter cropping would work here (and be more conventional), your composition gives some context which makes the photo more attractive.
I tried to take some recreational picture of a hummer this summer, and you either got REALLY close or have a GREAT zoom, you should feel really pleased with this picture, you got great detail in the hummer and thats just awesome.
Colors and lighting are awesome and you've captured the bird nicely. I just wish the DOF was deeper as I find the out-of-focus flowers to be a litte distracting.