A "quick sketch" refers to a rough, simple drawing that is done swiftly without much detail. It is typically used to capture the basic form or idea of something rather than creating a polished or intricate piece of artwork. Full definition
I want to try this site and draw quick sketch portraits with a difference who knows what window might open. (theabundantartist.com)
If you want to take notes (text only) or do quick sketches, there are a couple of apps that will do just that. (ubergizmo.com)
It comes with a small stylus that isn't required to operate the phone, but was actually pretty fun to use for taking notes or making quick sketches. (bgr.com)