I like your composition. Beautiful species; I could never get tired of kingfisher images. There are several hot areas on the perch, in the mossy parts, that could be darkened because I feel they take some attention away from the bird.
In addition to toning down parts of the perch (which is pretty awesome BTW), a better HA would have put this over the top. Beautiful BG, and good choice of comp.
I like the composition, and agree about toning down the perch. Better eye contact would have really improved this image. You guys are killing me with all of these awesome Kingfisher images!