The sun was almost below the horizon and was hitting the backside of the canvas wall helping to bring up the ambient light. There are two strobes at work here. A slightly left-of-center top down 2' octabox with a grid and a 3' strip box with a grid off to the right for a little fill. The octa is a few feet in front of the subject and pointed back to get the light in under the hat.
52mm · f/7.1 · 1/800 · ISO 800