The Isuzu police do get around once in awhile. Although, I've not seen them for some time. I does get into a touchy subject but, there should be no problems with personal pics showing up on a calendar. Especialy if there is no profit margin. They really frown on making money when their logos show up in print.

If you do want to use a special photo for reproduction, it's not the dimentional size that constitutes resolution. It's acually how many dots per inch the photo is comprised of. A good guide that I have seen is between 600 and 900 dpi or higher.