Well gang I wouldn't even try to equal Glenn but for a few years I made a nice bit of extra cash doing a few art shows. it was about 4 or 5 a year as I recall and looking back at some of the shots that did sell I can see i had/have a lot to learn. the one big advance IMHO is the ability to shoot relatively noise free shots at ISO's that were unheard of on the beginning of the 2000's. I offer this as one of my early works that sold quite well, maybe because the American Robin is the CT State Bird?
Kevin in CT