Hmmm, you know what I would do? I would get out my Sharpie Markers and get the essentials down on paper really quick. The reason for this is when I think of Rastafarians, I think of kinetic energy (because of the texture and waves of their braids) and I think of bright colors and music because of the islands where they hail from.
Don't worry whether it's accurate. Just put a quick figure together and concentrate on the energy of the image. What a great question!