As Andy says....as for pictures.....If you have a look at some of the youtube videos you'll get an idea - this one for example:
https://www.youtube.com/watch?v=zELTUe5edh0
Pit stop window usually after 10 minutes and before 25 minutes, pit lane speed limit usually 60 kph - and it is checked! Engines have to be switched off on stopping and not restarted until the new driver's belts are fastened, and usually a marshal will be checking that belts are properly fitted over the HANS.