Mary's head is visible under the lying figure's skin when light hits it directly, and she's balding from her disease.
This represents 2 things: Her own words "between the disease and the drugs, I look like a monster", and also how James saw her, but because of her behavior and his own pent-up anger for her, not her appearance.
The sexualized lower half of their bodies (as well as that of the mannequins) possibly represents Maria, who might have been on James' mind long before she manifested, as a means to cope with the stress of being Mary's caretaker. The novel mentions he wanted to meet new women but couldn't bring himself to cheat on Mary while she was sick.
It's especially shocking if we take into consideration that James hits and stomps the monsters with so much rage and disgust.
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