I love the choice made here to use skin tone as the backdrop to the red lips. It would have been so easy to Pohotoshop the colour our of the rest of the image and keep the red lips in order to accentuate the focus. Instead you made a simple yet totally brilliant choice of using colour (the skin tone) to get the same effect.
I was also particularly struck by your choice of angle. Rather than a straight down the lens approach (which so many people do), your choice of angle has given the image a far more dynamic and immediately striking appearance. When it catches my eye in a thumbnail you've certainly produced a great image. Nicely done.