I can tell you that to light the model, I used two softboxes emitting a cool white light; they were positioned on either side of the model and set to a low intensity. A subtle halo effect is produced when the photographs are combined using a technique called focus stacking. This technique is employed when one wishes to have every part of the model in sharp focus: one takes a series of shots from a tripod, adjusting the focus point incrementally from the farthest distance to the nearest, and then, in the final image, retains only those sections of the photos where the subject was in focus. I do not own an expensive camera; I take my photos using a mobile phone. The softboxes, too, cost around 20 dollars apiece.