Please help!! I have found an oil Painting from Lee Reynold?

I've found an exquisite oil painting in my great grand mother's basement. In which she never new she had.... I am trying to find any type of details on how I can research the painting and find if it is of any worth. Please let me know. This is has to be at least 22-by-28 inches possibly bigger.. - Thank you for your help! - Derek