I exaggerated the flow in my drawing a bit but I still contend that the strands in your model run parallel, when in reality they converge at one point on the arm. Because bodybuilders build their muscle size to such extremes the insertion point is obscured by the juxtaposed muscle groups that it tucks underneath.
see how the strands actually gather more as they get closer to the insertion point on the arm.
Sorry if I’m being too much of anatomy nazi.
I still think your work is awesome.