It sounds as though you may have a print of a Julie Bell painting. Julie Bell is a renowned wildlife artist, and she has her own webpage with examples of her work for sale. I have had a quick look through, and your item sounds as though it might be a print of 'Madison River Morning.' Of course, it is impossible to give any realistic advice without seeing the item in person, and you might want to have it looked at by a dealer in art and collectibles. If it is an original, then it is likely to be very saleable, but if it is a print, the value will be that of any other purely decorative item.