Happilymarriedman
I'm currently working on a novel myself. I'm having some issues visualizing the characters I can write descriptions all day long. How often does an author come to you and give you a relatively vague description of what they are seeking, is there an extra cost for dreaming that stuff up?
Ben McSweeney
Well, generally speaking there's always going to be a cost if you're commissioning someone to illustrate your descriptions. Before you go to the expense, one suggestion I might put forward is to cast a few actors in the roles. Don't tell anyone who you choose, but if there's someone out there who would perfectly fit the role, cast them in your notes and then use Google Image and IMDB to collect reference and let that lead you. Also, don't overdo the descriptions when you do get down to the actual words-on-the-page... Pick a few notable features, be consistent, and allow the rest to be inferred.
Brandon is actually not very interested in portraiture for the published art in the novels... you may notice that we very rarely show anyone's full face in our illustrations. Part of this is because Brandon doesn't want to force the reader into imagining the characters looking just one way... the image you create in your mind when you read a description is yours, it's the part of your reading experience that you create and it should be as valid as anyone's.
That being said, I got to help Michael with Shallan's portrait in the Words endpages, and that was great fun for me as well as leading to a better, more accurate Shallan.