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It'd be nicer if the dolphin was made from smooth triangles.  And it's left eye
appears to be several inches outside its head...


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dolphin is a bit angular, and its eyes don't quite touch its head.

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good idea, needs more sophisticated shading.  
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Your dolphin needs work.


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You may want to randomize the position of the fish a bit more.  Schooling fish
are pretty random, and there seems to be some clustering there.  Somewhere out
there is a model of a dolphin that is more detailed and looks less
"triangular."
Looks good!
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Pov-Ray contain the SMOOTH TRYANGLE command.  
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The scene doesn't look as 'underwaterish' as is could do.
Try putting fish into the grid randomly on or off (ie if RAND > 0.5 then put
FISH , ELSE dont put FISH.

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Well, the lighting and colors are nice.
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For POV it's perty good. I can only say to add more textures (not flat mirrors)
and use smooth triangles for the dolphin.

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well what is that 


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While I like the concept, there were a couple of things that bothered me about
the picture.  The dolphin could have been rendered with smooth triangles, and
there were too many fish looking a bit too orderly.  Perhaps rotating the fish
location about the radius of the ship may have made them look a bit more
random.


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It's hard to tell exactly what it is...

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Nice image of the dolphins characters in the book
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The facets on the dolphin are distracting - he should be smoothed.
There are no visual cues to tell me that the ship in farther in the
background, at first I thought the dolphin was being carried by the ship.
There are no clues that this is an underwater shot either except for the fish.
How about some atmospherics and under-water style lighting?  BTW at the depths
you are describing in your text, there would be almost no reds showing.

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This picture wasn't perfect, and the author should do better job.  Somehow I
liked the idea.  Here is what I am thinking.  Many science fiction stories
do involved with machines, but also animals.  Bio-robic machine or anything 
similar could be a very good idea about what will be happend in science
fiction.
Similar idea was from a game called "BioFoge" by Origin.  I personally think
it is a great idea and has some successful connection to the title.

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Nice image.  The ship was a little confusing.  The fish looked nice.  Should
have smoothed the triangles on the dolphin model before using it.