Quick and dirty:
Sheri's Portrait: The eyes are far overdone, she's an alien

The wrinkles around her mouth should stay I'd say, simply for the reason they make her whole shape more reasonable. Hard to explain but the smile seems to dim without the wrinkles and make her chin look harder somehow. And a bit more color might make her look younger
Lisa & Molly: A tad overdone, yes. Lower it a bit and it's just fine. But it's got some touch of green, don't you agree?
Marriage: Good to work to me, nicely cropped and I also like the blur in the background.
The last one is a little small to say anything...
Attached my suggestions (to the left)