Model is good, makeup and exposure is fine.If the model is supposed to be about to throw the spear, she needs to be tensing all her muscles.Mark Sisson comments: "Just remember that throwing isn’t just about the arms and the shoulders. Much of the power is generated through the hips (like throwing a punch, sorta) and the flicking of the wrist helps with accuracy."As such, proper throwing shouldn’t just get you a sore rotator cuff. It should work your core, your posterior chain, and your upper body. And heavier objects require more muscle involvement, obviously. Don’t throw a twenty-pound rock like a baseball (or a javelin)."Eadweard Muybridge would be an excellent research resource: