Not sure how you'd like to be roasted considering its a sketch, but her left eye is too low,and her hair seems to extend a little to far out from the top and her back. After that, my commenting would give further suggestions that may be a bit much for a sketch that may not go any further than it has...
Not a problem ^^ Given reason I could help better than that but for a sketch, I felt that just that was appropriate just yet. Feel free to label something as a 'rip it apart' and I'll nit pick the whole pic with anything I can think of