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Hey Mark,
The subject is nice, sharp and pretty, I like how it immediately attracts attention.
I’d like to see a tad more space on the left, as one of its anemones is cut.
Composition-wise, I wonder if it would have looked less cluttered if you had put the crab on the lower power point, as opposed to the top one: more of that out-of-focus blur, less of the brown algae.
Another approach would be to try & turn that background black, by maxing out your shutter speed.