There are a few points I can make specifically regarding this image:
1. Subject matter: What interests you in this scene - and what would interest your viewers about this scene (personally I have little interest in birds' back sides.
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2. Framing: a crucial part of a photo that had not been addressed here, even with a decent crop. Choose your orientation and cropping to highlight the subject matter in your image. What's with the concrete slab included in the frame? How does it add meaning or value to the image? (ask yourself this)
3. Lighting: not bad, but distracting due to the reflection of light off the water - would have been better to shoot with a polarising filter under these circumstances.
4. Symmetry: working with patterns or repeated subject matter, it is important that the composition of the image follows some sort of recognisable shape/form or symmetry since we humans are pleased with order and meaningful patterns - although impossible to do yourself, a better more regular arrangement would improve interest.
5. Creativity in PP: little effort, it seems, was put into post-processing of significance - this goes a long way in transforming good photos to excellent ones.
Hope this helps.