From TvDBwiki

[edit] Actor Image Rules

• Images should not be stretched in anyway, if you can't find high quality images that meet our requirements please leave it for someone else to fill in.
• There should be no writting on the actor images.
• Images should ideally be head shots or stay above the waist, full body shots are allowed but if possible we prefer no lower than the waist.
• Images should show the actors in their roles. General actor images will be added later, for now we like each show to have images picked for that show.