I like 3a more than 3. To me 3a has more depth of interpretation of what's going on, and I feel the composition & lighting work better together. Maybe she's a mermaid about to disappear into the lake.
Beautiful all, of course. And capture treasured moments.
But then once in awhile a fleeting moment happens of wonder. Number 6. So subtle. Dreaming? Remembering? Aware of the photographer? Knowing? The lips could speak of thoughts of nursing. The bliss of that.