Hi Blindv,
That's a nice composite. I can see what you might regard as a clash of the titans, but it may just be because the colors don't quite mesh. I don't have John's doubts about the precise light direction (though he could well have a point). To my eye (for all that's worth

) the moon could be a little less vivid, and the lighting on the model could be cooler. She is, after all, basking in a blue moon, not on a sunny beach. The attached is a quick example of what I'm talking about.
There are lots of ways to accomplish this; here's how I did it. Starting with your image, I made a copy of the moon on its own layer and desaturated that copy completely. Then changed the blending mode to screen and lowered opacity until it looked right (about 60% for the posted image). Redid the outer glow layer effect with the new color. Finally isolated the lower half of the image and applied a fairly strong blue photographic filter - can't remember the exact strength, but again just slid the slider until it looked right.
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