Gnarled Oak is a vector illustration of an old tree with faces I did when I was learning Illustrator. Looking at it now I think it holds up OK I see a lot of spots I would improve upon but overall not bad.
Space was left for some ad-copy.
Close-up of lower faces
Close up of upper faces. Looking at this 8 years later I can see a lot of room for improvement. Maybe that will be my next project.