I personally don't mount fish but I would say that is a good size to mount. I know some people prefer a gill that is a foot, but how often do those come boat side?
Probably to late but I would photo the fish and have a replica made of it. They look great and last forever. I have a few skin mounts but will never do it again. The replicas are so good and and you get the thrill of releasing the fish.
I do not have any personal fish on the walls. I have however moutned a few for my kids. They each have a Walleye and Crappie, the one boy has two Crappies. One thing I ouwld do oif I were mounting fish again is to do replicas.