This looks to me like there is more going on here than two-toned shading. Isn't there some kind of other effect? Not pin-striping or something that obvious but I don't know what to call it. I probably can't afford to duplicate this paint job, but if I could....

Note that I am thinking about color before deciding on the frame - perhaps not the practical order but it is fun I am going to have a long discussion about my fitting needs and the geometry of the three frames I am interested in with my fitter before I select the frame.