This T-shirt design has a strong figure/ground relationship. The simplistic background gives the form context, giving a distinct form. It is through that empty black space that you are able to evaluate the design. Along with the this relationship there is typography present. The strength of the figure/ground relationship gives strong legibility as space is being used as space.
Compositional flow brings your eye through the composition as a whole. Your eye is first caught by the word and headphones, then moves to the portrait, and then to the background before moving back to the black space. That black space creates continuance for the view, allowing the eye to naturally flow with the visual information thats there, and then imagining your own ending to the form.