You can't just pick people for their hair color or the shape of their face. You have to go with the best actors.
George R. R. MartinA man of the Night's Watch lives his life for the realm. Not for a king, nor a lord, nor the honor of this house or that house, neither for gold nor glory nor a woman's love, but for the realm, and all the people in it. A man of the Night's Watch takes no wife and fathers no sons. Our wife is duty. Our mistress is honor. And you are the only sons we shall ever know.
George R. R. MartinI do play all the characters, when I write them, one after another. If they actually had to film me, the only one I could play would be Samwell Tarly or Hot Pie.
George R. R. MartinShe yearned to see her mother again, and Robb and Bran and Rickonโฆ but it was Jon Snow she thought of most. She wished somehow they could come to the Wall before Winterfell, so Jon might muss up her hair and call her โlittle sister.โ Sheโd tell him, โI missed you,โ and heโd say it too at the very same moment, the way they always used to say things together. She would have liked that. She would have liked that better than anything.
George R. R. MartinI feel satisfaction at the end of the day when I've written a scene that I really like or when I write a good line of dialogue that I read out to my wife or something like that. But there's also days where it's just bloody agony and I go, 'ugh, this is such crap! Why did I think I had any talent?
George R. R. Martin