Your artwork is by Walter E. Brightwell Jr. who often used the name "Westal." The artist, though, recently deceased is not very well represented (by important dealers). If you are trying to determine the value of your work I would suggest contacting the following dealer or consulting the auction houses that have sold the artists work in the past (consult askart.com). You will usually find with most artists that there is a significant difference in value between the auction market and the gallery retail market. Check the gallery retail market first.
Contact this dealer, provide them with all the information regarding your work including a photograph, provenance, size, year (if known), medium (if known), etc...
I am a Art Dealer (not associated with the dealer suggested above).