I’m starting a new study for the pipe wrench. In this drawing for the study, I have fixed some perspective problems and more carefully drawn the teeth in the jaws. I’ve also revealed a bit more of the linear adjustment gear on the left side of the image. This is a 16″x20″ canvas and the marks are from an Indigo Blue Prismacolor Premier Colored Pencil. I find these pencils are good for drawing on canvas. They are waxy so the lines stay put and don’t mix into the paint. They come in a wide variety of colors and values so it is always possible to choose a color that won’t show through the paint.