Quizzy, wish I could help but as I don't have the pic, I'm stuck. Terry Pratchett? Apart from him, the only other people with beards tend to be terrorists. Is the person young or old. Any clues you can give?
Daniel O'Donnell? Val Doonican? Sorry, they're the only Irish singers that come to mind at the moment. Oh yes, Bob Geldof(if you can call him a singer) and Bono?