We have several pictures, but no one is sure whether they are W. H. Jr or W. H. Sr. No dates or names on them. As far as I know, there are no pictures of Jr around. The PULLENs weren't too interested in photographs, typical for that era and rural lifestyle.
Since Jr was a County Assessor in Oregon - twice - I think it would be a safe assumption that somewhere up there as County Assessor, one could find a picture.
You're right - your task is an awesome one, beyond huge! Hope I can help you futher at a later time.