A few days ago I needed to trace some lines quickly. So I did it in an oldschool way by using the window. So often you correct things in Photoshop, scan, redraw etc. I’m sick of my computer from time to time and just get creative to avoid it as much as possible using traditional ways of painting.
There’s an interesting book about the techniques of the old masters I’m reading at the moment. It gives you some information of how to prepare your painting surface, make brushes, tracing paper and things like that. It was written in the 15th century as a guide for students by Cennino d’Andrea Cennini. It’s so interesting and I cherish my ready-at-hand painting tubes a lot more. Here’s the link to the book The Craftsman’s Handbook (Dover Art Instruction)