Really nice
Well done ashman, youre really starting to get somewhere with your art. great work on this fish although there are some messy spots that you couldve easily fixed (highlight at end of tail, whiskers). Nice work on the colors although it would have been nice if the background had been a slightly different color from the fish.
The way his head sits on his neck is a bit weird; his neck seems to bend upwards (on the canvas), but his head is angled down(on canvas).
Composition wise I would have been nice to have some 200 pixels extra below the fish; not just for the fin.
The bubbles have already been mentioned, but Ill mention them again.
One last thing I cant really place is that really bright line on his nose... looks weird to me.
All in all a great job