I always love it when I see a photograph I shot that has extra details I don't remember seeing. This is an example of that - I knew I was shooting nature-made flower images I found in the sand as well as the shell under the left flower and the grittier sand at the bottom. I'm not sure I noticed the intricacy of the two darker feathers. I'm not sure you can see the detail in them on this lo res file but they are pretty striking when on the hi res file.
My point (or tip) is that you should look for surprises while you shoot and be thankful when they show up courtesy of the photography gods.