Yes, the fish looks cool. Focus and DOF is good, too, however, there is dirt on the background (aquarium glass?) and the fish melts a bit into the light-colored gravel. What color is your fish in real life, would that have been better? In any case, I know how difficult aquarium photography is (I never manage to get a single good shot, so high points anyway).
This is one of my favorites this week... excellent shot! I see two possible improvement opportunities on this photo... 1) get the dust specs of the glass on the right side of the frame... 2) possibly use a vertical crop to cut the right side of the frame off just to the right of the fish's eye behind the first gill... GREAT SHOT!
Good contrast on the fish and with the background. good dof. The flecks on the glass are a little distracting. But then again, this might have been beyond your control.
I didn't like this as a thumbnail. The larger photo is much better. If I wanted to take the time, I would have touched up the litter in the water. It looks like dust or scratches and detracts from the subject. But overall I like it.
Nice shot,would of got a big 9 off me if not for the flecks on the glass. Hope ya don't mind but I put this photo on PS Elements and cleaned it up(I know you can't do that for this) and it makes a super photo. Clean it up and enter it in another competition and you'll do well. good luck:-)