Drawing of a mouth - side view - draw a straight line to see the angle/slant nose to chin; also look for negative space to get the form of the mouth. So helpful because I want to learn how to draw faces from the side as well as I do from the front!
Sharpie Sketches - Horses by ColossalBeltloop . I once heard an artist say that she liked to draw in pen because there was no erasing, and it helped her learn to accept imperfections. That seems like a good (albeit somewhat painful ) idea!