There are not a large number of people who keep native fish (maybe fewer than there are species of fish!). NANFA is the best site for profiles and questions. They have a forum too, so one option is posting your picture and asking for advice, similar to this site.
Another thing I've found useful for identification is just using Google to produce images of suspected matches. Sometimes you get vendors' websites that will have pictures. BTdarters has a few of the more popular ones. Luckily for you, Etheostoma is probably the most widely kept group of native fish, and there are a few people selling them.