Here's what worked for her and can work for you when you want to sing with a smaller dynamic.. first verse or breakdown 1/2 chorus are common places:
Sing everything with all of you! From your heels to your face... your whole being has to be involved.
You need to support and communicate the lightest places in your song as passionately and purposefully as the highest, longest, loudest notes. This works for all genres of music.
Think about it... do you want the audience to be lightly involved with the first verse? Or do you want to engage them from the start... making them understand something from your very first lyric? Here's a fact...if you don't engage them at the beginning, you'll likely loose them for the rest of the song, too!
Like a great athlete or violin player, even the smallest moves are deliberate and purposeful. If you just sing from your shoulders because the passage is not hard or you're trying for a quieter dynamic, you will not communicate. Don't tense your body, but do involve it. And pronounce your smallest lyrics as clearly as your loudest. Support (as Power, Path & Performance teaches -- without pushing) every note with breath.
Something to think about the next time you want to sing soft. Your comments are most welcome!