How do I find samples of this? My idea is to have students draw the boundaries of sets defined by inequalities of complex variables or to draw the image under a mapping.
At an MAA meeting (probably MathFest) I saw a presentation by someone who had students draw an answer in WebWork. In particular, the student had to draw the derivative of a function. If I recall correctly, there was a tolerance set so that the student didn't have to be exact in drawing.