Originally Posted by
DonSchap
Well, to widen the plane of focus, you need to up the aperture to around f/6.3-f/8, maybe even as much as f/11 ... when you are close. Using anything wider (like f/4-5.6) requires you to back up significantly.
Slow down the shutter speed to no slower than 1/60 ... if you do go slower, to reclaim light, you will get motion blur. When people laugh (not just smile), they do not freeze but tend to move.
If you need more light, you will have to use DRO Levels (+3 or more) or your ISO -> Up it to 800 or 1000, as necessary to recover.
Remember to focus on the eyes ... lock the focus, then frame and finish the shot.
Hope this helps.