Experimenting with the shutter speed is the best way to determine the correct shutter/aperture combination for your situation. In this case, the 1/60th version doesn't imply enough motion to be effective; the 1/30 & 1/15th versions are better. (Copyright 2010 / Andrew Boyd)
To light a foreground portrait subject against a setting sun, put a hot shoe flash inside a 36-inch umbrella-style softbox (A), and warmed up its output with a 1/4 Rosco CTO warming gel. assistant suspended the Softbox above the subject using a monopod (B) as a boom. posed the child to block the setting sun. Canon EOS 5D (C) and 17–40mm f/4L EF zoom at its 35mm setting. fired the flash with PocketWizard Plus II, for an overall exposure of 1/180 sec at f/13, ISO 100.
Tip on Selective Focus… One of the best techniques in photography is to use a wide aperture to throw the background out of focus, while shooting portraits, which is also called as selective focus. The idea is to focus on the subject’s eyes, select a wide aperture so that the eyes and part of the face are in focus, while the rest goes out of focus. More at https://www.facebook.com/photo.php?fbid=10151350130832045=a.243402462044.146726.176693602044=1