Always a good idea to start with a Jack Kirby pin-up and this is from Uncanny X-Men #8. I thought it would be a good idea to show how the Beast has changed over the years.
The big version of that is over here, by the way.
And this is him hanging around with Psylocke in X-Men Annual #1, courtesy of Tom Grummett and Bob Wiacek.
The larger version is over here, true believer.