Charles is one of my painting heros. He is based in Gloucester Massachusetts in the USA and is not only a brilliant painter but an inspired teacher. Sadly he has never produced a teaching DVD but here he is discussing how to paint a picture with each stroke applied left alone to produce what he terms "a glance" of a subject. Watch it several time to let it sink in and I am sure your painting will improve. Charles used to paint mostly in oils but now predominately in acrylic which is what I think he used here.