don,(posted 8377 days ago)a few tips:
1) shoot in broad daylight, harsh sun. 2) choose a spot with a much more consistent color scheme (in your photograph, you have grass, then water, then more grass, denoting a depth of field that you're dealing with in terms of a few feet to infinity). Choose a location that doesn't leave the viewer staring out into infinity. You never want to distract from the model too much. Also, pick a background color scheme with bright, saturated hues. You want this color photograph to jump out at you. 3) use a white sheet as a diffuser for the harsh sun. put it a few feet over your subject and hold it via two assistants. 4) use two gold reflectors to warm the subject. 5) use an on-camera flash to put some sparkle in your subject's eyes. 6) step back from the model and use your 100mm lens like a 180mm one.
and then study your model incessantly and figure out some good positions and expressions for her to wear. I think she would carry more impact with her mouth closed than with that "conked on head" look :)
jon, do you know what power flash borges uses? He uses a single flash, but I'm betting it's out of some portable ultra-WS flash pack :)