A single blossom from my garden is apparently the essence of simplicity. The power of these images of flower blossoms relies on this apparent simplicity: you are supposedly looking at the whole blossom and nothing but the blossom against a straight black background.
To the casual glance, the only real photographic control involves lighting. Simple as these compositions seem to be, they do depend upon attractive overall lighting.
Sometimes the apparently simplest things are the hardest to pull off. It would be a mistake to underestimate the craft that goes into these straightforward compositions.
Related images: Frilly Goddesses; Topography of Camellia.