Sorry I made the wrong choice of Con for you Jim.
Due to my physical limitations and the often restrictive drawing position available at a Con I limit my sketches to A4 (ish) pencil headshots. Most often from a ¾ angle because it offers the most interesting view and allows me to focus on the personality of a character rather than varying basic structure—and hopefully, maintain some conversation with those on line so I don’t feel like a ‘battery hen’.
As I explain in my Artsale FAQ, drawing commissions has never been a priority for me but I do sometimes take a few ‘Non-Commission’ (or ‘Pre-drawn’) 17x11 pencil sketches, of the type posted in the ‘Unpublished Pencils’ section of my website, to a Con. I don’t have any definite plan or strategy. It’s all on a whim.