If you don't see it in the stock folders you should ALWAYS ask permission before editing an image .. regardless if you credit or not
I also shoot with a K-5 but have yet to try ISO 80. Do you perceive any appreciable between it and 100 to have a preference for 80? Some folks say they do and some say they don't.
Amazing retouch - stylish and underlining her beauty.
soul Love your work.