What is it called when you only draw the outline of something, and don't add values for

shading?

It's line art.

Lineart, Outline, etc.

Explanation:

I'm assuming that you're asking what it's called when you don't add color, shading, etc. to an outlined piece. In this case, an outline would suffice, but it can also be referred to as lineart, draft, frame, trace, etc. Many synonyms to the answer you're looking for.