I know blown highlight are supposed to be bad, evil, sinful things, but I have to say that there are cases where I prefer it like that.
Anything blown out here is just the very brightest bits of very white feathers, and to me it emphasises the brilliant brightness of the bird.
It could be just my shortcomings as a photographer speaking, or my personal bad taste (or my monitor being particularly good at rendering whites?), but I wouldn't want this egret any other way.
Love the blue and brown soft-coloured water too, and the bright yellow eye and bill, so I'm not in favour of the B&W either.
In fact, I can't think of any more constructive comment than this: Great shot!