Oh, a card game of your own? O_O Sounds very cool, I'd love to hear more about it, if you didn't mind ^_^
The shading's so... solid, but soft. I bet even if the line-art were invisible we could still make out what is what ^_~ The background looks awesome too... the texture looks very realistic. I like how her hair looks like it's gently blowing in the wind. Her uniform looks very good ^^ Nice color combination. Great job!