Anakin Starkiller said:
However, I find it hard to believe Luke would never have seen actual pictures of him.
Actually, I find it hard to believe Luke would ever have seen actual pictures of Anakin. He didn’t even know that Vader was his father, his uncle carefully hid this information, and the only pictures that could exist of Hayden-Anakin belong to Padme, who died years ago on another planet where Luke never set foot.
But I respect your opinion, as nor Shaw-without-scars nor Hayden are a fully satisfying choice. I just think that Shaw is less unlogical than Hayden.