Thanks to everyone for all the links and comments.  That model actually 
began as a sort of generic shark probably more along the lines of a 
great white, with the wide head for massive jaws and streamlined shape. 
  But it kept gravitating towards the species with the smaller head in 
proportion to the body which for me always seems more menacing.  Just 
like on those mannered late Roman statues, the exaggeratedly small head 
makes the body seem more powerful even while it would be actually the 
huge jaws of other species of shark that are more dangerous.  So now 
that with the help of you all I can actually fix on a particular species 
to model, it is time to take the mesh back to the shop for some 
significant improvements, hopefully.  Meanwhile the lighting is going to 
take a lot more understanding obviously.  The link on how to do 
underwater lighting was very informative on that.

The most current render looks like a step backwards. lol.

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