Thanks, guys.

I was pleased with these also. I could do with a bit less noise in the OOF areas, but on the other hand I didn't apply any noise reduction.
The uncluttered backgrounds are mostly from 30 feet to a few hundred yards away.
I'll take credit for moving the camera around to get things lined up as best I could.
But really, the distinctive appearance of these pictures is due to the use of a short lens that's also wideangle for the sensor size. In theory, there's no problem taking these pictures with a larger sensor. But it's not easy to find a lens that's wideangle and will also focus short enough but not too short. Even with all the stuff I own, I don't think I have the components to shoot these pictures with my DSLR.
Bruce, thanks for the compliments about composition. Some of that was done by moving the camera around until the image on the viewscreen looked good. The choice of near-square format was driven by a "subtractive" process -- I took the best image I had, and kept cropping away stuff I didn't like until it was (almost) all gone. When I was done cropping, there was one annoying bit of leaf left, slightly visible but distracting at one margin -- so I deleted it by cloning. That bit of editing didn't seem worth mentioning until now.
--Rik