I often see people posing in weird and unnatural poses to hide the things they don't like about themselves. The results are rarely good. Below are three ways to look better in photos.
When you want to avoid the dreaded double chin don't tilt your head up. It just makes to look silly and your nostrils bigger. Instead stick your chin out and straighten your neck.
To look slimmer in photos turn partially sideways to the camera, planting one foot in front of the other. Point your toe to the camera and place your weight on your back foot. Then tighten your stomach and slightly stick out your chest.
Experiment with expressions while in front of the camera. Every photo does not need the big smile. Try smiling with only your eyes, winking, or looking away. This will give your photos more of a personality. When in doubt make a silly face. You'll laugh and relax and your photos will be beautiful like you.