It doesn't belong to an anime series, it's from a webcomic called "Homestuck" and holy crap, is it amazing. Even though there might be some bland moments, it'll repay when things get serious. I highly recommend people to read this webcomic. *o*
This looks gr8! I love the detail of the clothing and the simplicity of the colors! The only thing I would work on would be the lips/teeth and the placement of Mindfang herself? Maybe put her off to the side or enlarge her so there isn't so much blank space in the image! Otherwise, well done!