Comment by withinboredom

I think the fact that anyone in this thread thinks it's ambiguous is proof by definition that it's ambiguous.

"Right hand" is practically a bigram that has more meaning, since handedness is such a common topic.

Also context matters, if you're talking to someone you would say "right shoulder" for _their_ right since you know it's an observer with different vantage point. Talking about a scene in a photo "the right shoulder" to me would more often mean right portion of the photo even if it was the person's left shoulder.

Having one person in the frame isn't enough to unambiguously put us into the "talking about a body" context.

"Plug into right power socket"

Same language, opposite meaning because of a particular noun + context.

I think the only thing obvious here is that there is no obvious solution other than adding lots of clarification to your prompt.