It's not good enough for the drawing and the white lines look weird.
So I guess I would suggest white paper or a very light colored paper with black ink.
You might want to have "Pianist and music teacher" instead, and all on one line. That way you can use it for more things. If you list Performer first, it may not make as good of an impression on a student. I like "musician" instead of "performer," but "pianist" makes it a little more concise.
A plain keyboard or simple music note would jazz it up a little.
The hand looks like bad technique
I don't mean to bash your artwork. I've heard hands are very difficult. Making them reproducible for a business card must be even more so.
I don't mean to offend or be negative. Just my thoughts.
You should draw a few more piano keysboth black and white and lower the fingers.