Michael,
Only a little bit late to the party, but thought I would try my hand at this one - As you say, for practice! 
First, what a great capture of the egret with wings unfolded. I especially like the ripples in the water.
Agree with David - not much, if anything to improve on with the b&w. The egret really pops. I also agree the darker/contrast in the water above/left of the bird is slightly heavy, but that’s hardly worth mentioning.
So I thought why not try processing in original color. One thing I started noticing early on is that the blues in the image when exagerated say with saturation, turn blotchy with patches of magenta - like some sort of chromatic abberation - only all over. It’s somewhat noticable (if looking for it) in my final version here. And I’m also going to post a big crop and exagerated blue saturation to reveal the patterns. I have NO idea what this is, and can only speculate that perhaps the higher 5,000 ISO might be contributing. There was a good amount of noise as well.
But alas, the noise was handled quite well using BOTH the new DeNoise feature in ACR, and then on top of that I sent thru Topaz Denoise too.
Oh, and painstakingly cloned out most of the debris, feathers and such on the water surface.
The crop, just enough to get closer, but didn’t want to loose the ripples. My goal was to bring even more emphasis to the egret, so added a pretty strong vignette and also blurred the vegetation up top. Not sure if that helps, but gives more of a shallow dof look.
I did initial processing in ACR with a slight drop in overall exposure, reduced highlights, and tweaked Vibrance, dehaze and of course the Denoise. In PS, added the vignette, another SAT layer, a burn layer for futher work on the vegetation. A general Levels layer to squeeze the end points and boost overall contrast a smidge.
Resize/save for web using TK’s NEW TK9 panel and various tools.
Again, can’t say I could have improved the b&w, so went with the color.
zoomed in patch of water. Not obvious, but you can start to see the magenta patterns in blue. Again, from RAW with only exagerated blue saturation. If you take the saturation slider to the max it of course shows up (now I tested on a blue-sky image of mine and maxing out the blue saturation did what normally happens, the color/sat goes wonky, but not in patches. Weird, I have no explanation.