As I look at them more, I was wondering why #1 was initially my favorite and then I switched to #3. I love the composition and the way the light falls, and the great use of negative space. I prefer the comp to #3, actually, but I think the background is too distinguishable and it's ultimately distracting.
As for #2, I again thought that I'd like it the best because I love the delicate folds of the sheer curtain, the contrast provided by the color of the flowers, and the balance of the flowers on the left of the frame while the curtains and blossoms lean gently towards the right of the frame. I just wish there weren't that opening in the curtains.
I know they are tiny niggles, but they are ultimately why I decided the third was my favorite, even though I liked specific elements of the first two better. The third one comes together in a holistic way as well as in the details.