You are right. Body language can (and should) always interpreted with the context in mind. What we did was to describe the case which fits 90% of the time – without blurring the cards with exception disclaimers (e.g. this person may also be on medication for his/her eyes or a tiny fly just poked the eye).

We will start writing a little intro to the cards: context is important and there are always exceptions to the rule.

Thanks for the input.