Cool.
It's very well done. As always, your style is gorgeous and pleasant (even in spite of a demonic summoning!) I love the texture placed on it; not a filter-rape, but rather an enjoyable little addition to the piece. I love her hair, and her head in general.
I do, however, have one huge problem with it. The legs. I implore you to try and sit like that. You can't. If you can, you definitely won't be able to smile whilst doing it. The closest you can really comfortably get would involve your legs going back instead of to the sides. It would look a lot better and wouldn't have your character in contradictorily cringe-worthy pain to have the legs going behind her knees, with some perspective placed on the legs.
I feel it would be a good suggestion for you to always test out a position in real life while mapping out the position of a character in a drawing before drawing that character in a bad position. Even still, it's a good piece, and your works are continually feeling more and more complete. Keep up the good work!