"I noticed her posture relax slightly" |
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I agree that sounds slightly unnatural because it's clinical, and not something we would normally think or say.
What about something like "She uncrossed her arms and leaned against the sideboard, a smile hovering on her lips". I know I've included "smile", but I've added other stuff which dilutes the effect of "smile", if you feel you've overused that. Or take the smile out altogether. And because crossed arms are supposed to be defensive, uncrossing them implies relaxation, yet it seems more likely that even an unobservant person would notice someone doing that, even if not consciously.
In most first person writing (depending on the exact style you're using) I'm not convinced the description needs to be something the person would actually
say when telling a friend - I think it's okay to include things they would be aware of, even if they didn't think about it.
Deb
<Added>Yes, do post another example when you have a chance, and we can all have a think. :)