I could learn a thing or two about anatomy from this fellow. Artist is Alberto Ruiz.

Anatomy 19032017 by NeoArtCorE

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Nsio Pose Practice 8: Sayaka Overweight by Nsio on DeviantArt

Pose Reference Sheet of a chubby girl - different poses: lying, eating, sitting, talking.  nude gesture drawing

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Note that the breast on the right doesn't agree with the gravity of the breast on the left. Natural breasts would partially cascade to either side of the ribcage, like the one on our left.