A semi related topic, but is anyone familiar with how fine-art photography is handled in most countries? If I employ myself by selling prints to my own local markets, do most places still count it as 'employment' if I travel on vacation with the goal of touring places I haven't been while taking photographs that would later be processed and sold?
When I have entered a foreign nation in each instance I have been asked, either orally or in writing what the purpose of my visit is, and I've entered a number of other nations over the years. If I lied about that and got caught I'd expect to be arrested if they had the jurisdictional ability to do so. I have, for example, entered Canada for the explicit purpose of going to Brewers' Retail and purchasing Canadian Beer that I intend to immediately bring back to the US (paying the duty thereupon as required.) When asked at the border what my purpose is I tell them: "To spend American money at Brewers' Retail." When asked how long I intend to be in Canada, I tell them the truth again: "About 30 minutes, give or take traffic conditions."
In this case you wouldn't get caught at the time as ascertaining your purpose would not be likely on entry, but later on when you sell said prints the other nation may discover your sales (or efforts to sell) and, if and when they do they may well prohibit you from entering again if, on your previous trip, you lied about your purpose for being there.