I've been a bit afraid of Mypaint lately (go figure, no rational explanation for that). So, I thought, let's paint something just to get a little feel... This came out.

Mypaint, Gimp, about an hour. (Yes, it is RGB noise. Looks better to me that way and camouflages some mis-painting... )

Not bad! She's pretty, with a slightly exotic look to her (at least to my eye).

Are you going for a no-shadow "40's neon poster" kind of style? If so, that's fine. If not, a suggestion would be add more shadows, especially around the eye lobes. Remember that the eyes are actually wrapped by the eyelids and often shaded by the brows during most lighting conditions. Whereas it's possible to have straight-on light like this, adding shadows is a cheap way to make her look more alive (since it will enhance the contrast with the eye-highlight).
There is something a little off with her lower lip, something is off in the perspective. Either way, there is normally shadowing there, just so you know (a crystal-white smile along the entire length of her mouth is quite extreme, which is why I suspect you are going for a more iconic style with this).
At any rate, these are of course just some suggestions. And no need to be "afraid of MyPaint, it is your friend.
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Griatch