I believe, from following the last few weeks challenges and winners selection, that it falls on me to judge this, having won last time.
There were only six entries. Daacon, Bramela and smf submitted their themes in one post each, then followed with a picture representing that theme, per Dan's original suggestion. Dan did allow for using someone else's theme, and the other three single posts (by xjjohnno, Skyntara and Rockmaster) were all based on smf's original theme of "Flower Power.
Bramela (Bruce) is in the throes of Southern Hemisphere Fall/Autumn, and he chose "Colours of Nature" with Fall leaves that certainly fit the theme with beautiful colors and nice bokeh. I rated this #1 both purely subjectively on its merits as a picture, and for fulfilling the original suggestion from Dan completely.
Daacon (Dave) choose "Clouds and Sky", and his picture shows nice tonal range and color. I rated this #2. I like it a lot, and Dave also posted theme first, picture second.
smf has a rather nice macro of a tulip highlighted against an essentialy black background. I'd have liked it more sharper, and/or with some other background, but I loved its simplicity . I gave it #3.
xjjohnno has an interesting macro tightly detailing the stamens and anthers of the bottlebrush plant with a very narrow DOF. I love this plant (and submitted pictures of the one in my yard in POTW a few weeks ago). I wish there was more use of the glorious color of this plant, which is why I rated it below the first 3.
Skyntara's little pale blue flowers are interesting, nicely defined, and the fingers added color and a different viewpoint.
Rockmaster posted a picture of a yellow lily that is pretty. Lighting is harsh - bright sunlight is a very difficult lighting for these flowers, as I've also found trying to picture those in my back yard this week! I ended up with a makeshift diffuser and a little fill-in before I got what I kind of liked...
Well, that's my take on these, with no formal training and based on what I like!
Well done, all.