Having grown up with Touhou, (specifically the games) I've always loved the characters. Remilia is no exception. For this one, she's quite cute, but, sadly, she hides her face if you don't have your toolbar set to "Touch." I do wish there was more of her on the left side, as that's been left (Totally not a silly word re-use) black and empty. Maybe adding Gungnir there would fill up that space?

Overall, a good theme, just wish it wasn't so empty towards the left. Great work!

Blends in well with tab titles, smooth horizontal transition, overall easy on the eyes.
Don't forget to enlarge the toolbars as much as possible, otherwise Remillia's face will be partially hidden.