All of these images have one thing in common: brisk morning air and gorgeous glow from the sun. Location, time of year, type of session and outfits are all secondary. The light is what matters. Every time.
If given the choice, I will always choose 7am to meet for a session. (followed closely by sunset, but I find it harder to pinpoint the start time because you're racing the dark).
I know. I know. It's not easy to get up extra extra early, and when you have kiddos to wrangle or otherwise uncooperative adults, it can be difficult. I promise though... get to bed a little earlier and just make it happen. You'll get dreamy images every time.