Thanks for the comments, all. This is actually a tight crop shot with a 70-200mm and not technically a close-up. The details in the center of this flower caught my eye and I wanted to capture it, and as I processed it I realized that they eye was distracted by more and more of the background objects so I cropped in to this. I'm glad it was as appreciated as it was - I don't have a lot of backlog to pick from for these deep challenges.
I agree that the dark spot can be distracting, but I didn't want to crop it out because I liked the parallel look in the bokeh, and it helped you realize the size of the flower since it is more obviously a sunflower. In retrospect I should have dodged it a bit to make it less obviously dark.