Great to see a nice overview of best practise in app store screenshots. As an app-developer I also would like to stress the benefit of good screenshots. To add on these best practises I think you shouldn't do a real life example of the app in use without having some serious equipment (camera/lightning) and possibly "models". The author mentions to do this with care but my 2cents is just don't do it. I've only seen a few decent tries on this and generally that would be an app from a well-funded company that obviously spent a lot of effort/cash on it. Those screens set the standard in that genre and for a small developer to compete with that is not effective, do a digital less-is-more screen with good copy instead.
