I can't notice Celes so well, but the mixture of colors looks cool. Celes has such a sad faceHow about darkening her face just a little bit?
I do gotta agree with julius here. Her face is really soft and needs to be darkened some to make it stand out some more. Maybe give her a very slight black glow to help her stand out.
Also, the text looks a little bit off-center, moving it left a few pixels will make that corner look more even.
And if you dare, you could even go in and add in some lines to her face (like the eyebrows, eyesockets, inside of the ear) and smudge them to give her face more details. This would take some trial and error though, but would give her more features.
I do like that background though, very nicely done and blended seamlessly too.