Thanks for sharing! For all that I've seen of the bare resin and plastic versions, it's rare to come across painted examples.
You're quite right to be happy with your/her results - there is a lot to like about these. Lots of smooth blends, nice, subtle
OSL... I really like what you've done with the bases, even (seriously - that little gradient makes it feel like the model is under a spotlight, adding a nice touch of visual interest that isn't at all distracting).
As far as criticism:
I'm struck by color choices on the skin of two of the models - the first one posted from both you and your wife. I see what you each were going for, shading with a contrasting blue-green in one and a red to harmonize with the details in the other, but I think the effect is a little too strong. It could work wonderfully if it's sufficiently subtle, but at first glance I thought one had heat rash and the other was developing verdigris.
That very specific criticism aside, I think the next - and probably hardest - step in reaching that higher level is to focus on faces. They're arguably the hardest part of a miniature to get right (how many threads have I seen asking for advice on how to paint eyes?), but they're also a, if not THE, main focal point of a model. Really nailing a face can improve an otherwise simplistic paintjob, just as a crudely painted face can ruin an otherwise exquisite model. Some examples here are better than others, but improvements can always be made.
Sadly, I'm a more experienced critic than I am a painter, so you'll have to wait for others to offer more specific advice on
how to go about it, but hopefully you at least find the advice on where to focus helpful.
We all have room fro improvement, of course, so let me say again: Great work and thanks for sharing!