Your painting sounds a lot like the one by this artist currently shown in the price results pages og liveauctioneers.com. This site requires only an email address to sign up to, then the price results are free to access.
Any item is only worth as much as another person is prepared to give you for it. Some artists have become well known and collectable, but this doesn't always mean that their work has more merit than a painting by one of the hundreds of thousands of amateur artists who are not famous and not collectable. Your picture may well be by one of these hobby artists who turn out beautiful work that has only a value that reflects its worth as a purely decorative item. If you like your painting, put it on the wall and enjoy it. Not all good paintings are valuable in monetary terms. If, however, you feel strongly that your picture is a hidden gem, seek further advice from an art sales professional such as an auctioneer in your local area.