When you use flash outside you can get much better lighting on people’s faces.
You can see the difference between these two photos. I was demonstrating this technique in Kona, Hawaii to the YWAM School of Photography class a few years ago. I shot this wide so you can see how the assistant must walk with the people and stay slightly ahead of them, but close to them.
Here I cropped out the assistant, which when I am shooting a job I have them out of the frame, so I do not have to crop. Hopefully you can see how the lighting is helping the photo here.
I showed how to do this with hotshoe flashes and with the studio strobes. The advantage of the larger strobe was the ability to stay farther away from the subject, due to a lot more powerful strobe.
Before walking and talking I started by showing the class how using fill flash off camera works. Here there is no flash and the subject is back lighted.
Here just using the hot shoe flash off camera I was able to shoot at a faster shutter speed of 1/8000 due to the HSS [High Speed Shutter] technology now available for most cameras. This let me darken the sky quite a bit.
I have found that getting the sun behind the subject allows the subject to stop squinting. Then by adding the flash off camera the light is creating some modeling to the face as well as lighting up the face.
For the “Walk and Talk” I ask subjects to stay very close to each other. I even say every once in a while you should feel the other person touching you. I also ask them to make eye contact. I generally have one person talk and the other person listen.
Try this technique sometime with your subjects. If you like you can hire me to work with you or your group to teach this in a workshop.