Come with me...

I tried to emphasize differences:
Angel and demon
Lighter colors/darker colors
Lighter shadowing/heavier shadowing
More traditional clothes/modern clothes

I based the background on Chinese mythology -
Pheonix(Huang): Yin. Symbol of virtue and grace. Appears in peaceful and prosperous times. Female counterpart to the dragon.
Dragon: Yang. Symbol of power.

The wings took me the longest. And I don't really like Hinata's hair. Other than that I'm pretty happy with this
I hope you are too

Oh and Hinata is supposed to look indecisive about going with Naruto. Dunno if I really accomplished that though

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Hinata and Naruto belong to Kishimoto

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Hinata's bg:
swirls --> [link]
feathers --> [link]
pheonix --> [link]

Naruto's bg:
cracks --> [link] (also used for N's wings)
splatter --> [link]
dragon --> [link]