Direction and quality of light: four directions, two qualities, one ideal
Front light is easy to expose and 'looks flat and uninteresting.' He turns a few degrees off the sun to get the shadows back.
Front lighting (sun behind the drone) gives shadowless, flat images - step a few degrees off axis for depth. Back lighting (sun behind the subject) gives rim light and huge dynamic range; three handlings - expose for the sky (silhouette), expose for the ground (keep sky out of frame), or expose in the middle and blend with masks in post, 'even though it is more work' his preference - and it makes fog and mist 'light up and glow.' Side lighting, roughly 45 degrees either side of the sun line, is 'my most common approach': visible shadows, manageable range. Top lighting is midday and 'usually not desirable.' Quality: hard light from a small source (the sun) makes hard-edged shadows; soft light from a large relative source wraps and flatters. Fully overcast is 'too soft' - no direction, no depth; the target is soft and directional, like a half-lit sky at sunrise.
The planning question before every shoot: where will the sun be, and what will it be doing?