I did the Annapurna aswell mate but I don't remember posters there but there was a few solo female backpackers about which is good for them in some ways but they take a chance I think, some of these country's view western women different to us don't they thinking there all pawn stars, the women are confident tho arnt they and you can't really tell them, I kept a couple of them company and safe tho so atleast I did my bit lol, lovely the Annapurna isn't it I love Nepal .did you do any other trekks etc there I did the Everest base camp from giri which was really hard but loved it never forget it