Done in Adobe Photoshop.
I think that the style of her face was partly inspired by Magical Stage Fancy Lala, because I just finished watching the first tape (again). ^_^
She was originally going to be looking backwards wistfully, but the colors were to vivid to be a sad picture.
I had originally done a couple of backgrounds, but at a friend's suggestion, I'm going to add in a garden-type wall behind her instead, complete with moss and small fern-thingys.