I enjoy the mild shadows in the background. It sets up a nice atmosphere for the piece. The solidarity of your blacks are appreciated, as well; they're very smooth and I feel that helps set this piece apart from most pencil drawings. The only thing I feel could use a little work is the top edge of the fish. It really just needs to be tightened up to the level of the rest of the piece. Top notch work, though!
You're welcome. I would like to invite you to visit my music site [link] when you have the time. There's also a poll concerning my music, located on my profile page below my ID, if you care to participate.