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Thank you all for the positive remarks! Plas, I'm glad you like it. I didn't do anything different with the hair besides just illuminate it better. I took some time to get the lights better this time; I finally realized that the way to light up the pony tail and the cape was to illuminate it from behind. Learn something new every day, I guess. Anyway... thanks again for the feedback, and for the help in getting it to where it needed to be. 
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well it really did come out great man!! great job!
It is really nice. I wish I could do stuff like this sometimes.
Proper lighting is extremely important to making anything look good in 3d. In your image, you have the figure lit a certain way against a background image that was lit differently, so the two are never really going to come across as integrated since they don't share the same lighting setup.
The backround image looks like late afternoon, still bright but with shadows appearing behind the buildings. If I were going to render your image in my 3d app, the first thing I'd do would be to set up a bunch of simple geometric shapes that were lined up with the buildings in the picture. Then I would use planar or frontal projection to map the background on to actual geometry, which would then interact with the lights in your scene.
I would have one spotlight or distant light to simulate the sun. You'd try to position it so that the shadows it produced matched the pre-existing ones in the background image. Then I'd have a skydome or some sort of radiosity setup that would simulate the diffuse light spread through the rest of the sky that was lighting her body.
Finally, I'd have a third light beneath her that simulated the light bounced/reflected back up from the ground below her.
I don't know what kind of lighting solution is available to the application you're using (Poser?) but most programs can at least manage a standard 3 point light setup. If you want to learn more about 3d lighting, Jeremy Birn has an excellent book that explains a tremendous amount.
www.battlewraith.deviantart.com
Great job Sartori, Much better pose, gives a very heroic feel to it. Really gives the feeling of zoooming through the air. "Is it a bird, is it a plane, is it a pink fireworks expostion of energy? no its Plasma stream"
That white emo belt has got to go. The belt from your sig is much better.
Thank you all for the positive remarks! Plas, I'm glad you like it. I didn't do anything different with the hair besides just illuminate it better. I took some time to get the lights better this time; I finally realized that the way to light up the pony tail and the cape was to illuminate it from behind. Learn something new every day, I guess. Anyway... thanks again for the feedback, and for the help in getting it to where it needed to be.