Art style: Realistic Photography.
The diagram now highlights the third, larger heart in the center of the octopus's body, with red arrows showing oxygenated blood flowing to the organs and limbs.
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FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt):
Render this image entirely in "Realistic Photography" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Realistic Photography". Keep the subject, composition, camera angle, lighting direction, and colour palette from the description above — but EVERY surface, skin, fabric, material, and environmental element must be rendered in the "Realistic Photography" idiom, not in any other medium.
