To re-design the repeating leaf pattern as one interlocking shape, I first made a perfect circle to trace the outward curves on. Then I repeated the circle 4 times to be equidistant from the central one, with their edges touching in alignment with the center of the middle circle to trace the inward curvatures and points on. After that, I drew the additional lines on the left side of the central circle, and then copied and reversed them to make the shape bilaterally uniform.
