There seems to be two schools of thought. 1) To create a replica that captures the essence/signatures of the species and reminds the angler of every (rainbow trout, bass, crappie whatever it is) that they've ever caught but this is the biggest one - or whatever. 2) To create as close of a replica of of the exact fish that was caught. Both have their high points and low points. It seems as though the market is trending more towards option 2, rather than 1. But I get a few option 1's from time to time. Just make sure that you price yourself accordingly if you're going to focus on option two as it is (usually) considerably more time consuming. Also, examine your own skill set. If you want to focus on option 2 - do you have the capabilities to actually make it happen? Some guys have it, some guys dont. It takes time for everyone, though.