When I wanted to study Chinese painting I had an former pupil who was then attending Shi-Da post an online ad for me on one of the university boards. He specified that I wanted someone who could speak English.
I found a student who was in her last year studying to become a elementary school art teacher. She knew how to present and explain painting skills and techniques very well.
I would recommend her but she disappeared after a few lessons.
In any case, it might work for you. Another option is to post an ad at one of the Mandarin language schools like TLI.