I like this a lot, especially the tension and feeling of expectation I have when I look at it. One thing I've started discovering this year (I only got brave enough to use colour very recently) is how adding layers and touches of unusal colour to skin tones can make them sing, come alive--especially in the shadows and highlights. I'll often use purples and greens in my shadows especially if they are present elsewhere in the composition. I like to layer colours by using semi transparent 'washes'. In comparison to the colour of her eyes, her skin is rather flat and desaturated in tone...it gives an impression of nighttime or gloom...adds to the tension, I think. I also like the little areas of white you've left throughout. It makes it look so much like a 'real' watercolour painting.
I was just suggesting you use more references because there has almost always been something technically wrong with your faces. I just dont think you have the curves, shapes and proportions of the face down yet. You could always use a picture of a face, and make alterations to it.
eh.... I have this weird style, that does not translate well with the mouse... pencil, its alot easier for me to get the shapes right, here they come out looking squared, or fat, or just, fucked up.
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