you seem to have the basic vectoring skills, so i have to say this: no stroke paths please! i want to encourage you to start using shape layers =]. eyes could use some more depth, and i think it would be nice if the hair has more highlights OR if the colors were deeper/darker.
but i love the concept of this wall and thats my favorite scene in ouran ever XD. your cellshading and everything looks very clean and neat, so i think its time for you to try something new XD -looks forward to it-