Illustrator Challenge #9
Draw 10 boxes in a row - about 1"x1". The first box stays white and the last box goes as dark as you are able to get it (hopefully without embossing). Fill in the boxes in-between in a gradient from light to dark. Work slowly, build up the pencil. Keep your edges neat. Keep the value even. This is a value scale which can come in handy for all sorts of future work.