Want to be photogenic? It's all about your jaw, according to photographer Peter Hurley as he explains in this video. Basically, just stretch your forehead forward and down a bit to accentuate your jawline.
The video above is 15 minutes long but it does give good examples and clearly illustrates how you should position yourself and your head to look better in pictures. Jump to the 7 minute mark for the photo examples. Check this one out by a redditor:
By sticking your forehead out, you get better portrait shots. Remember to do this when you're laughing in photos too, to avoid the natural tendency to bring your head back and create a double chin.