3D to 2D painting, shader help

Hi, I would like to make paint over a 3D model. I want to render it as a b/w or greyish image to make a 2D painting of it. What kind of shader/render settings should I use that the light and shadows cast on the 3D model? Thank you!

Just use the default out of the box for shaders, and throw in a sun light:

There are no materials on anything, all I did was add a cube, a plane, a sun light, and switch to Rendered view. Adding a camera and rendering gives this:

For more definition in the shadows, add more lights:

Thanks! So are you in Display in solid mode of Viewport shading?