Thanks for your insight guys. This IS what I'm looking for. I think a second probem that I'm having is choosing which pictures to enter into contests. While I think CARLO's hawkfish was an obvious #1 , I do tend to vote very differently than the pool in most weeks. I suppose, not only does my photography need to improve, my selection needs to become a little more mainstream as well. The rationale behind your analysis helps me here too.
Regarding my shot....YES, it was cropped. The original was horizontal. I wanted to emphasize the details of the face a little more, and thought vertical might do the trick. In hindsight....well....
I too, would've liked to get a little more detail/sharpness in the shrimp. Dunno if I should blame myself, my non-DSL camera, the grouper (which kept swimming away), or the pesky shrimp which kept jumping around unpredictably. On second thought, 'Yes', I want to blame the shrimp. 
The 'uncluttered background' is a tough one. Of course, a photographer can always change the shooting angle or a setting, but ultimately, the background is what it is, right? I should probably add, I'm not a proponent of the SOLID, ONE COLOR, PHOTOSHOP backgrounds that I'm seeing more and more of. I like to see a picture in some context. Any suggestions here?
FWIW, here's the original (resized only)
