Perhaps the biggest change you can make to your images of people is getting to know them or see their world a little more the way they do. When photographing children taking pictures at their eye level is highly beneficial.
This picture has a totally different feel thanks to applying this approach. Having a camera with a flip out screen can help with that a lot. I often find this way of shooting far more discreet as well allowing moments which would end the minute the subject noticed I was raising a camera to my eye.
(Olympus OM-D E-M5 with 45mm f/1.8)