Visit flickr and look up the many (MANY!) excellent groups dedicated to various vintage bicycles to see how users set up their bike photographs. There are a lot of very good examples that will help you to make better decisions about how to best frame up and depict your two wheeler. Here are just a couple of good groups:
http://www.flickr.com/groups/oldcycles_/
http://www.flickr.com/groups/1866540@N23/
http://www.flickr.com/groups/610631@N25/
http://www.flickr.com/groups/moltocolnago/
http://www.flickr.com/groups/1368725@N23/