But there's more than just Fry: they've got Zapp and Zoidberg, too!

More Zoidberg fan art:

Fry and Zoidberg Costumes

Zoidberg fingernails!

I believe that the Zapp Brannigan painting is based on the portrait which Zapp has in his quarters, which we saw in the Season 1 episode Loves Labors Lost in Space, which introduced us to The Zapper:

The portrait of Zapp is perhaps itself based on this famous painting of JFK: