You can set authoring information display per content type, which takes the user picture with it, but this should be more configurable.
May tie in as far as code needed with something i apparently want so much i've posted it twice:
Show authors of all revisions on an article of content
Node Authors module: give multiple people edit rights to specific content based on userreference field
Except where otherwise noted, content on this site is licensed under a Creative Commons Attribution 3.0 Unported License.