Next question: cropping. What would you say is the best crop for something like this. Is it best to crop in to make the blue jay bigger and lose the sun/beach/bush shape - or leave it as is?
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I wish somebody would pay me for it.
So I'm a big believer of getting the composition roughly correct in camera. Admittedly, I shoot like a drunken sailor a lot of the time so I am fixing horizons, but I try to get the subject roughly where I want it while shooting and then finesse the crop in post.
Not having been standing next to you for this image, it's hard to say exactly what I would have done, but based on what I can see from your frame, I would have put the bird on the upper left rule of thirds line. Compositionally, you don't need all the trees on the left side cluttering up the image, and you've cut off the pretty sunset on the right. You have really lovely rim light going on around the tree limbs closest to the bird.
I do a lot of center compositions in my work due to some of the cameras I use, but this is not a scene crying out for a center comp. The bird gets lost too much in all the branches, and I do think if you'd rotated to get more of the lake behind you you'd have had more open space that would have highlighted the bird better.
This is a really crummy content aware fill recrop from Photoshop, but it shows how I would have composed it in camera, even if some of the elements ended up being wrong; I suspect you might have had a stronger tree trunk on the right where those branches are coming in top right, which may or may not have played into your decision while standing there, but this is just an extremely rough example.