Finally got around to making an official reference sheet for good ol' Beck. I made this so I can finally give other artists a proper reference image of him instead of having to go based on others' renditions.

The brown area on the tip of his snout is optional. His markings do not need to be particularly accurate. Please request my permission before drawing him without his newsboy cap, whether clothed or nude. Other outfits must be based on the 1930s-1950s and must be masculine. He is strictly homosexual, please do not romantically or sexually pair him with women (even ones with penises or testicles).

UPDATE, 2024: Outfit 1 is his outfit on weekends, holidays, or other days when he doesn't work. It's his "casual" clothes, typically worn during autumn and winter. It is considered "Outfit 1" due to being his first official outfit since his conception as a character.
Outfit 2 is the outfit he typically wears when going to work or when he doesn't wish to wear Outfit 1 for any other reason. Not necessarily his uniform, simply clothes he considers less "casual." He also wears these clothes primarily in the summertime and springtime.
Outfit 3 is the outfit he wears by the time he and Roger become fathers. He is about 28-30 when he begins wearing this outfit. It completely replaces Outfit 1 from then on.