My neighbor (Heather Lancaster, more on her below) is a talented artist, so I suggested I might try engraving one of her pieces.
She took a photo of one of her pencil sketches, and I went to work. A little contrast adjustment, and we were good to go.
She is a big fan of walnut:
I wanted to see how it would look on a lighter wood, so I did a half-scale version on maple, too: