YOur Orchidea is a beautiful flower. I just sat and stared at it for quite a long while. While I think it met the HIgh Contrast Challenge quite well, others disagreed. That's the way it goes sometimes.
However, I would suggest that compositionally, you fill the frame with this beauty. Generally off-centered subjects work well, but in this case, the shape of the flower calls for full-frame treatment. Perhaps because the left side of the flower is slightly heavier.
Finally, (picky,picky) it would have been better if that bit of red in the right hand corner wasn't there. Perhaps (if you do it again) when you create the set up and place the bloom you could mask the extra petal with a bit of black, or simply anchor it out of the way. It's a minor disraction, but an unnecessary one. (of course, now that the challenge is over, you can just clean it up)
I'm delighted to have the chance to look at this image more carefully.
nice high contrast. i'm not sure about your space to the left. shot overall is a bit dark and perhaps cropping down on the more interesting lighter areas might have created a composition that was more appealing to me.
Wow... The deepness and richness of the tones in this image are incredible. The focus seems tack sharp too. It may be a tad on the dark side, but absolutely beautiful composition. Bumping way up.
While there is some contrast, for me, not as much high contrast as other entries. The shadows on the flower are a bit...overpowering. Nice closeup and composition.
this would have been better high contrast for me if you had used a light BG for these flowers(such as a yellow or white background) lovely orchids,great sharpness and good strong color. and love the added water drops. very nice photo just doesnt say High Contrast to me...sorry