Hi! I think you're going the right way with gesture. One idea you could try is to keep movement lines from becoming anatomy landmarks. You could make the lines either longer or more continuous (purple and light blue lines) or use one stroke to join different areas that serve a common movement (red). In the highlighted arms, for example, their direction and length don't really need to show which is the arm and which the forearm, but the arm of the figure on the right does need that distinction. Perhaps this could help with what you're looking for.