Danise:
I found this FAQ passage at
www.ozclub.org:
What are the copyright restrictions regarding The Wizard of Oz?"The copyright in L. Frank Baum's work, The Wonderful Wizard of Oz (later re-titled The Wizard of Oz), expired in 1956. From that point on, the book's original illustrations by W. W. Denslow and the text by L. Frank Baum, were in the Public Domain, and could be used freely by publishers and adapters alike. Derivative works, such as abridgments, adaptations, newly illustrated versions, and dramatic works (such as the MGM version of The Wizard of Oz) produced by arrangement of the copyright holders before 1956, are largely still protected by their individual copyrights. The International Wizard of Oz Club is unable to provide detailed information about later copyrights, but alerts all would-be users that they should verify the status of such copyrights before making use of possibly copyrighted works. The authoritative source for such information are the records of the United States Copyright Office, located at the Library of Congress in Washington, D.C. The records are open to public inspection, although the Copyright Office offers a fee-for-service searching service. Additional information can be obtained from:
U.S. Copyright Office
101 Independence Ave., S.E.
Washington DC 20559-6000
Hours of public service are 8:30 a. m. to 5:00 p. m., Eastern time, Monday through Friday, except legal holidays. During these hours you may telephone the Copyright Office at (202) 707-3000 to speak to one of our copyright information specialists. The U.S. Copyright Office has a very well developed Web site at:
http://lcweb.loc.gov/copyright/ "
I take this to mean that if you're doing your own drawing of a tin man, even if it's based on some previous design, you might be all right (surprise! surprise!). But contact the copyright office to make sure!