Mary and the Doughnut

I usually don't post pictures of people because I am horrible at portraits. For some reason they always look wrong. This one came out really great. There is something really different about the aspect, depth of field, lighting, etc with this shot that really grabs my attention. If I could just figure out how to replicate whatever I did that would be swell. It's my sister mary by the way... isn't she perdy!

Camera = Canon 20D
Lens = Canon 28-135mm f/3.5-5.6 IS
Shutter = 1/250
Aperture = f/5.6
Focal Length = 70mm
Flash = Off
ISO = 200