Well, isn't he cute. Fish with a little bit of personality always make fun subjects to photograph.
It sounds like kind of a fun game... Turn pump off, wait for fish to swim in, turn pump on, fish gets shot out... repeat.
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Nice work on the image as well!! I agree that a little bit more frontal lighting would help. This is often a problem when lighting from above and your subject is close to the front of the tank. I'm not sure where your flash was positioned on top of the tank, but if you could move it toward the front of the tank, that'd help.
Something else that you could do is to add a reflector infront of the tank to reflect some light back into the front of the subject. Doing this you need to be very watchful of reflections of the reflector. Generally, off to the sides and a little bit below (reflecting light back up) is pretty safe. You will not be able to move around very quickly with big reflectors out the front of the tank though.
The composition is a little tough to fit into the image format of your camera (length - width of image). The really interesting part of the image fits nicely into a square composition (which is not really a digital camera format). If you wanted to show the pipe (cause that is part of the game) horizontal actually works well. Just crop in a little bit. (we will be covering this stuff on Sunday).
The bubbles are a nice part of the image but they are a little bit distracting for me.
http://chrishudsonphotography.com/macog ... alNumber=1
What did I do to your photo...
- Sharpened it
Croped it square (after trying a number of rectangular (camera format) compositions)
Created a new layer
Increased contrast on the top layer (Levels)
Lightened bottom layer (Levels)
Erased the fishs face on the top layer so the lighter bottom layer showed through only in that area
Flattened layers
Saturated (& desaturated yellow)
Blurred bubbles (one at a time)