Every moment, we live through our eyes.
That thrill in our heart rises up into a twinkle in our eyes; those sparks in our mind crackle on as fire in our eyes.
If you want to capture the essence of a person in a moment, with your camera , all you need to do is look for their eyes, and click.
And when you do this with your subjects by window-light, you can see sunshine in their eyes.
Happy Photographing!