First up, let me say that I think this is a fantastic shot. Whether you had entered it in Black and White in Clor or Zen Photography I would have voted it a minimum of a seven. That of course just means that it is to my taste.
This is to me an absolutely suberb composition. I l9oev your use of negative space and shadows to give real depth to the shot. I also love the detail on the shell surface. The lines and flow of the Sand Dollar really draw my eye in. Congratulations on compiling such n effective shot. Technically there is nothing fundamentally wrong with this shot. The focus on the top edge of the shell is a little soft. I personally would have liked to see the dimples on the sheel in sharper relief, perhaps through the use of USM.
You've done very well with this shot, so much so that I'm not really sure what you could have done differently to do better. The voting distribution is weighted heavily towards 6s. I imagine you needed a little more 'pop' to turn some of those into 7s. Would more contrast and USM have added or taken away from the over all impact?
I hope my comments help and Good Luck in future Challenges!
Wonderful detail. Even though there is a lot happening due to the high level of detail, the way the organice designs fit in an orderly pattern really give the image a sense of balance. The color scheme is perfect, lighting helps add interest. I think its wonderfully zen. 8