When composing a full-length or three-quarter length photo of a person, including small children, your camera should be level with, and pointed at, mid-body, and parallel to the subject to avoid distortion. Since I'm 6' 1", depending of the height of the subject, I often hunch over, bend, kneel, squat, or sit on the floor when shooting.
Brianna was photographed in the doorway of an old deserted farmhouse. On my camera was an 18-55mm zoom lens leveled with her midsection from about six-feet away. The camera was set on P (Program), ISO 400, and the flash was popped up. The brightness outside blew-out the detail in the yard, which was what I wanted.
I rarely photograph a person straight-on because having the subject turn their body 3/4 away from the camera creates pleasing lines. I cropped the image to be narrow to compliment her lean and lanky figure, and used an app to sepia tone the photo and add a border.