My fellow admin Bertha has made a wonderful set of screen caps from Tahmoh's recent appearance in Haven. See all them at our Flickr site - clicking the picture below will take you there.
LiveJournal user Dragonlady981, who is also the admin of Tahmoh Daily (if you're on LJ, you should join this community), capped Tahmoh's scenes in Human Target. Check them out here at her journal. Be sure to get her permission before reposting or using the images in fanart.