It's hard to say, honestly.
I find the subject interesting because I didn't know crayfish came in blue. The composition is fine, I'm not sure how it could be improved.
I could tell it was taken through an aquarium though, if that's a shortcoming.
Truth be told, when I shoot threw aquarium glass or windows I list it as another peice of glass as if it where a filter with the lens and camera information, it is another peice of glass...not good glass but glass none the less
Well, a little bit of the hidden information about the composition, I personally would have liked to have gotten closer. All I had with me at the time was my FD 85mm f/1.8, Taken at minimum focusing distance this shot is cropped down considerably. Unprocessed shot is
here, I think with out being to required to crop it so heavily would have been a little bit sharper reducing the apparent visibility (?) of the aquarium glass. I do intend to take more shots of these guys and will try using my shorter lenses so, we'll find out on that one.
Now that you've mentioned some of their behavior, it'd be cool to see some of that.
Yeah, they are cool to watch, one of the few things I find worth getting an aquarium for. If you are going to look into keeping some crayfish for pets in the future I would definately advise just going out and catching some run of the mill wild brown ones locally and keeping them for a wile before investing in one from a pet shop. Their behaivor is the same and you will be able to afford to learn how to take care of them and keep them in the tank.
Oh, useful tip, if you do decide to get some. Something I do not believe they say in care taking FAQs, Do not reorginize the tanks, they are pickey and if they do not like the surroundings they will try to move. They move things around to their liking and if you go and move it back again and again they get pissed. My other sister who tried keeping some never listened to me and continued reorginizing her tank and she kept loosing them and finally gave up. The owner of this one is pretty good about that so I imagine these guys'll last a wile.