Rather than wallpaper I would take this opportunity to put together a fabulous gallery wall which will make your very handsome room look spectacular. Art (and books for that matter) lend so much personality and individuality to a room. A modern room like this can otherwise end up looking like a high-end hotel room which I'm sure is not your goal. It seems as though you also need a side table or two and lamps to give this room a warmer and more intimate atmosphere.