The "Cours de Dessin" was a 19th Century drawing manual used widely in the European academies (including by Picasso and Van Gogh - who copied all of the plates, twice!) In this video I explain how to go about copying from this fantastic resource to dramatically improve your drawing skills.
The book takes students through a series of exercises from simple to highly complex and is a really effective tool that you can easily use in your own home. Work slowly and make corrections wherever you see they are needed - the idea is that your drawing should be almost indistinguishable from the original. Push yourself and you'll be surprised how much you learn. You can find printable images from the book here (and in various other places, just look on Google).