Unless you purposely intend to, you dont need to emphasize the lips so much -- allow the lips' outline to break in places, and for the tone of the lips to mix with the skin at times. Right now they look isolated from the rest of the face.
Try killing some of that black around the eyes and eyebrows; substitute it for that brown where you can.
One nostril looks a little lower than the other, and the black is making the nostrils a little too noticeable. Maybe leave a little black for the rims of the nostrils, and substitute the rest for for that red that's in the hair.
Play with the cheekbones and jawline a little, and look at multiple reference pics to get a good idea of their shape at this angle.
Drop the eyes just a little.
Wonderful start so far -- you've blocked in the face in a very natural and organic way, which is essential to making a face look believable and is one of the hardest steps.