I need help looking for some paintings for art class. Help please?

Question

I need to find 2 artists who both have painted 2 paintings which include artist's materials (brushes, chalk, etc.) and in the background an unfinished painting.

Answer 1

"Interlude" by John Koch (http://magart.rochester.edu/VieO507$2130... ) is one.

Let me think a bit and see if I can find another.

Edit: Ver Meer's "The Art of Painting," maybe. Here's a detail from it: http://www.ibiblio.org/wm/paint/auth/ver...