The answer to this question depends up the image desired. If the desired image is of David Boreanaz in a variety of roles, then a general search for Boreanaz is appropriate. If Boreanaz in the role of Angel is desired, it is quicker to search for "Buffy, Angel."
Currently, Boreanaz plays an FBI agent, Seeley Booth, on the Fox TV series "Bones." Image searches under his name bring up the most current images from the TV series as of March 2015. If a user is looking for images specific to Boreanaz's role as Angel on the TV show "Buffy the Vampire Slayer" or his own spinoff show "Angel," the user should limit queries to "Angel, Buffy" or "David Boreanaz Angel."