Well done to get such a sharp and nicely lit shot handheld at 500mm. The lighting must have been just right. Did you use any supplememtary flash? Good plain bg. My personal preference is always to include a bit of habitat to give context to the bird, but if the only habitat available was a feeder, then it's probably better without. I know not everyone here would agree with me. Nice to have caught the tongue extended.
Lovely iridescence you got here, and I like the outstretched wing. I see where Richard is coming from in regards to habitat (or flower)...I think it is because the tongue is sticking out which implies that it was feeding on something close.