Very nice shots. Here in the opposite side of the world I see plenty of flower photos begging to be taken - but the spring winds are making it impossible.
But here is a shot of a Potentilla taken a few weeks ago, in this case a P. vesca growing as a weed at the end of the drive.
Nikon D800E & 200mm micro-nikkor, 25x stack. No artificial background, the green is just very out of focus grass.