This is one of those moments that works. The moment before and the moment after just didn’t measure up, despite having identical lighting, composition, and subject matter.
So, what’s the difference? It’s her. It’s her head tilt and accompanying expression… the spark that illuminated her face the moment the camera shutter was released.
It’s an example of what I’ve previously referred to as one of Life’s Little Moments.
(please click on the image to view)
↑Leica M9 and Leica 75mm Summilux @ f/1.4.
Prosophos 
this is great, colours are awesome and you sure nailed the focus at 1.4, well done
Thanks Rob. The winter sun was setting in the late afternoon when this was taken, providing some beautiful window light (hence, the colours).