just a few tips:

--skin is never a flat color. You have a basic skin tone and then you also have undertones. from person to person undertones can be pinkish, yellowish, greenish, whatever, its all very faint. You will also have different tone colors on diff areas, i.e. under the eyes, temples, chins, etc. so its always a good idea to use a bunch of diff colors.you can make light textures, you just cant make them flat and pale or your character will reflect the same and lack realism.

--iris could use a bit of detail and a color adjustment for realism.

--her lips look way cracked, and the lines are a bit crooked.

-- lower the bump map settings, i think its up just a bit to high for this.

In the attached pic (mirrored so you can see better) all i did was add in a few extra tones, and darken it up just a little bit. this way you can still have a light toned texture without it looking flat and pale. Defined the lips and tweaked the iris a bit. Its nothing drastic, not a whole lot of work, but it makes all the difference in the world. On the texture paint on some big splotches of ruddy colors, bluey-purply-gray under eyes maybe too, and gaussian blur em big time. Try playin around with layer modes then to get the look and oppacity you want. the point is just not to have an even color.

there is nothing even about human skin.

If you can, keep poser open while you are texturing so you can go back and forth between the two. sometimes colors will look way drastic and bold on the texture, but they render beautifully, so its good to always double check. just dont be afraid of color ;)

hope that helped some,
-Rio