its hard to see your actual path of the pose from a picture. You need to kick your shoulders up and back, hands on your hips and flare out your lats and sit back.
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thats my shitty lat spread, but i always took pride in my posing (I've won best posing in 2 nationals)
Tighten the chest, suck in the stomach, and pull your lats out until it hurts. I use my thumbs on my hips, some (like timber) put their hands out in front.
My suggestion would be to watch video's of competitors doing it the right way and just mimic them. I modeled my routine after Ed Corney's. he was smooth and graceful, and that helps pull out the poses properly.