Mr. Meyer,
There is an image of Woodruff in the collections of the Library of Congress and can be found here:
http://lcweb2.loc.gov/pp/pphome.html
A simple search in Civil War photographs (15) should do the trick.
Have an interest in both the 1st and 2nd Kentucky Regiments, primarily the organization and completion of the regiments at both Camp Clay, and at Camp Dennison.
Good luck with you're search!
John