I would suggest you consider cropping it. This is a great image for the rule of thirds. Putting the eye area of the head in the upper left 1/3 intersection point greatly increases the significance of the mouth and eyes, which are the focal points of this image. It leave enough environmental area to identify the location as well.
The expression on the face of the fish is priceless - you could come up with all sorts of captions for this. I'm guessing, based on the posturing, that these are two males having an aggressive encounter. (?) All the specular highlights are a bit distracting - you might remove some of them.
Jim, I think I know what your walking fish was looking at! :eek: :D ;)
Believe it or not, that is a direct munipulation of your original (with my crop) image. We've been playing with these on the OOTB board this week and something made me try your image. I like it! Hope you see something there as well! ;)