Great effort, Andy!
They're slightly underexposed. This is most likely to do with the large expanse of water in the background. The reflective surface often causes this, even on an overcast day. To overcome this you can dial in some exposure compensation in the + direction.
The white patch on the neck region of the bird is always a good indicator of exposure - it almost always look slightly over if you nail the exposure. I know it sounds odd but the amount of details you retained confirms to me that they are under.
During processing, we should bear in mind that this is a juvenile, and therefore the colours should not be as vibrant as an adult.
Lastly, there's a slight colourcast - perhaps you were using the 'cloudy' setting? This isn't a big problem if you shot in RAW as it can be easily remedied in post.
It might be worth including all relevant shooting info or leave the EXIF data intact should you wish to receive more precise feedback.
Hope the above helps. Love to see some more in the future!