A fabulous make up artist once told me,
If you're going to take a close up photo of your face -
Stick your neck out slightly to avoid double chin.
It might feel awkward, but it shouldn't look awkward!
Make sure you use the flash on your camera.
if you want to go all out, get something white (like a piece of paper) & hold it horizontally around your chest when you take the shot. Of course, don't let it show in the photo!
This makes the flash reflect beautifully on your skin & helps to hide any flaws!