Two things here that distracted me. The shadow on the birds back and the background is very busy. Maybe some blur of adjust depth of field to make the background less distracting.
Flamingo's are such photogenic animals - lovely colours and very graceful.
You have a nice colourful flamingo here enjoying the sunshine and a quick paddle which is nice and relaxed. For me, this shot would be stronger if the background was less cluttered. This obviously isn't always easy to achieve, but it does help through the viewer back to the bird and away from stray logs and cement walls.
If it was just the bird, the water, and the plant this would have been even better.
A bit bright on the highlights throughout and the general composition is just a bit too busy. I know how hard it is to shoot these birds. Blown highlights and cruddy backgrounds plague me a swell.