Hi Bill, I hope you’re having a great day! 
Some have suggested that they’d like more canvas on the right and I’m sure that you would have included that space if it had been there in the original image.
Way back when I first started submitting images for critique, I got a little frustrated hearing suggestions that seemed impossible to accomplish, then I realized that those suggestions were from folks just trying to be helpful.
And that those suggestions were considered good information for the next time around.
For future reference, it would help us to know what software you’re using for your post processing, that way we can give advice or instruction on how to accomplish something specific. For example; Ps has most of the same tools that Capture One has but the way they’re used (and named) can be quite different.
I decided to take this wonderful image of yours into Photoshop (Ps) and Adobe Camera Raw (ACR) to see what I could do in regards to adding some Canvas and Content Aware Fill on the right as @Kris_Smith suggested. Sometimes it doesn’t work as well as we’d like but in this case it worked pretty good IMHO.
BTW, ACR is very similar to Lightroom (Lr), ACR doesn’t have as many fine tuning features when compared to Lr.
What was interesting to me in this case was adding the canvas on the right first (under Image>Canvas Size), then as a second step, select the newly added canvas, then use “Content Aware Fill” (under Edit> Content Aware Fill), the AI did a horrible job of filling in that area.
But when I used the crop tool to increase the canvas by sliding the crop adjustment handle to the right (with the “Content Aware” box checked), it did a good job IMHO. I think it’s a matter of how the AI analyzes the “Sampling Content”, maybe it has a better algorithm? I’m not sure but this method worked much better.
Here’s a couple of screenshots with text showing the method for adding canvas and content aware at the same time.
And the results (below)
And a screenshot showing an exposure mask where I decreased the exposure of the sky some to bring more emphasis to the Anhinga. (this could have been done in ACR as well but it was an afterthought and I thought I’d show another way to get it done
(below)
Your Original Image (below)
The edited version showing the added canvas with automatic content aware fill, raised exposure on the head, neck and tail, and lowered exposure on the sky. (below)
I still thinks it’s an outstanding image and certainly one we would all be very proud of
Please don’t hesitate to post more of your work and please feel free to ask for anything specific, even help with site navigation.
We are all eager to help and interact with other photographers, we don’t bite, we might bark a little once in a while but an old dog like me needs to do something to make sure I’m still alive 
I’m just kidding about the bark comment, we don’t even growl unless it’s quietly to ourselves.
Hope this helps, Bill
