Lifelike features such as simulated breath or subtle sighs add a quiet layer of realism to a doll. These effects usually rely on compact air or hydraulic systems that cause gentle chest movement, a faint rising and falling of the torso, or a soft exhale. Not every doll includes these elements, and controls can vary from model to model, so it’s important to understand the specific setup and operating instructions. Regular inspection of seals, hoses, and connectors helps prevent leaks or misalignment that can disrupt the illusion. Battery life or power sources matter for any electronic component, so plan charging cycles around a shoot or display schedule. Realistic features also extend to tiny details—rollers of eyelids, microtics of fingers, or a faint rhythm in the throats—that should be kept quiet and well-maintained to avoid a mechanical feel. Maintenance steps include gentle cleaning of movable parts, testing the response of the breath features before a session, and storing the doll in a position that prevents undue strain on joints. When presented thoughtfully, these features can enrich a scene with subtle, almost imperceptible realism.