I know HuffPost isn't the most reliable source (lol) but I don't see why they'd just lie about something as trivial as that. apparently the dimensions for alot of those images is 20"x30".. but I know what you mean Ken. for a perfect example of what you're talking about, check out a guy named Chuck Close. he does the same kind of hyper-realistic images except he does like you said, works on a MASSIVE canvas that allows him to work in all the detail.