This is a photo of an English Robin, a bird often seen on Christmas decorations and cards, and next to it a logo created by tracing the photo in an iWork document.
When designing a logo based on a real life object, it is much easier to use the "tracing paper" technique. Tracing paper is what tailors and engineers used to use to make copies of paper patterns and blueprints. Thin, semi-transparent paper was put over an image, which showed through the paper. Contours of the image were then traced with pen and ink.
The same method can be used in iWork with the draw tool.