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!
qnq: kyuenkyu: This site has some cool arm anatomy, especially about how it changes as it twists, which is often neglected in references. my early work had basically tubes as arms, or arms behind body, lol