I spent a couple of hours doing some plein air yesterday at a farmer's market. The son of a vendor came over and we had a nice chat about art and he got some free tips (and a pencil!) from me. When I was packing up he confided to me that he could tell I'm a "really good artist". And the reason was:
"When most people make art the pencil lines are really dark. But yours are so light you can barely see them."
So there you have it - the key to artistry. Avoid dark pencil lines and you're golden!
And what's this? A new shirt? Why, so it is!