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I love the macro shot in its detail and compostion, but it looks unfinished with only two petals colored in. Odd numbers are generally more pleasing. Try a third petal (perhaps the one in between the yellow and purple petals) and find a complimentary color, or experiment with various combinations.

You are on to a great idea here, and the basic shot is technically solid. If you post others shots similar to this, let me know.