for very well known celebrities the us government archives may have something a google image search on site gov may bring something up also the search engine on the archives website may find things that google doesn't for people with military service the military might have something google search on site mil for celebrities that were well known before there may be newspaper photographs that have fallen out of copyright these will be hard to find but the library of congress may have something a further option is to contact the celebrity's agent or estate and ask for an image to be released under gfdl creative commons attribution or creative commons sharealike attribution licenses in my opinion if free use images can't be found the second best choice is a promotional photo it's an image that is intended to be distributed widely of course there are exceptions for albums singles and dvds a low resolution scan of the cover is always appropriate for movies a still from a well known scene or a low resolution scan of a promotional poster is good failing all else other fair use images can be used but they need to be tagged justified have the source copyright owner credited and used very sparingly as for the images at iron maiden i'm still trying to figure out how strict i should be about fair use images all the images there are directly related to the subject of the article except image prisonernovel jpg which i've just removed all of them have some semblance of a source indicated all of them have some semblance of a fair use justification and none of them seem to be surplus to the needs of the article i should probably push to have the justifications be made more explicit