Who is the painter W.S.CHANG?

There isn't enough information to definitively identify a painter named "W.S. CHANG."

To help me find who you're looking for, please provide more context:

* Full name: Is it William S. Chang, Walter S. Chang, or something else?

* Time period: When did this artist live and work?

* Style or subject matter: Is there anything distinctive about their work?

* Nationality: Do you know where they are from?

* Any other details: Do you have any specific artwork titles or information about exhibitions?

With more information, I can try to identify the artist you're interested in.