I know I post pictures quite a bit. But go with your mental image.
There are only Two (and a half) Rules:
1) The person must be in the movies or on TV (but doesn't have to be an actor/actress). The person can be specific to a role, or just the person themselves.
2) You have to post a link to a picture or an actual picture of said person in the comments.
2.5) Pictures of fictional or comic book characters will be accepted.