First off, this is very nice picture. The plain background helps keep the viewer's eye on the main subject (you, since it's a self-portrait), and you've positioned yourself off-centre which is a much more interesting view than if you were dead centre.
I really like how you've used similar colours to unite the picture, such as the leaf and your lipstick, and even your hair and skin tone are similar colours. This also helps with distinctions such as the colour of your eyes.
I also like the asymmetry of your face. The bangs covering your left eye help emphasize and draw the viewer's eye to your right eye (which I might add is a very pretty colour).