Take the Pen Tool (P) to give more volume for the figure:



Select next parameters Blending Options>Gradient Overlay:







Represent one more thin stripe, applying the same Blending Options>Gradient Overlay



Continue by representing one more this stripe, setting the previous adjustments for Blending Options>Gradient Overlay:



One more stripe should be drawn on the bottom (having the same parameters):



The last one should be represented on the lateral side, but this time the Gradient Overlay will be different this time.