This is the thought behind Drawing on the Right Side of the Brain[0], which I've always meant to get more in to after purchasing the book in college. One simpler way of saying what you said is that when asked to draw a person, many draw a stick figure, and yet, that is not what people /look/ like, or rather, are /seen like/. The five components listed on [0] reinforce what you've suggested ("imagery data") are required for true sight-to-paper 'drawing.'