Anyone trying to sketch the Moon's face soon gives up hope of capturing all its details. Instead, try mapping just one small area throughout its phases. You will see how even small lighting changes can reveal crater terraces—or make a rille pop into view on a mare.
Pick a region or a feature, and settle down with your telescope. Use a magnification that captures the whole feature in the field of view. Lightly sketch the main parts of the feature using a sharp pencil, and then shade in details with a 2B pencil, smudging them with your finger or touching up with an eraser.