I have been playing with my Flash while my daughter was playing in the garden.
The Idea was to use the flash as a fill-in flash. But when I was trying to set the right settings, I saw the dark sky and decided to go a different route.
I had set my camera to 1/120 sec., f/22, 50 iso. Then I started to make some tests while I reduced the output of the flash till the face of my little lady was lit correctly. Then I used Adobe Lightroom to adjust the exposure, vibrance, and clarity. Just click on the photo to see a large version and the other photos.
[Canon 5D, 16mm, Flash (M-Mode), 50 iso]