Personally, I don't care. Again, I don't care. Again, this would have NO bearing whatsoever in my opinion of the actor. So long as I can read it, I don't care. The industry standard is 8X10.
Quality is important.
I have had some amazing fortune with great quality photography, no matter if the reproduction was photo quality or a Xerox copy. If you're on a budget, shop around. You can find lithos with very near photo quality at a fraction of the cost. Give a few to your agent for pecial occasions. Keep a few for yourself to give to directors and producers on call-backs.