Slow is the whole thing
Slower turns, slower reaches, slower blinks. Speed reads as nervousness and it's the fastest way to undercut a polished look. Nothing else on this page matters as much.
Shoulders down and back
Not military-straight. Dropped, slightly back, with the collarbone visible. Tension in the shoulders shows up in photos as a shortened neck.
Open hands
Fingers relaxed and slightly separated, wrists soft. Clenched or hidden hands are the most common tell in otherwise good photos — and with long nails, hands end up in frame constantly.
