I haven't looked into it for years, but I'd have a hard time using the real fish... especially a large musky or pike... I'd rather put it back and let it continue to grow.
replicas in the past I thought looked bad but I'm sure things have improved as well as the artist doing the work could only help...
Personally I might want a replica, but simply a good picture of my catch I'd prefer for the wall, maybe an 8x10...