Donna- your great grandfather was an extraordinarily talented man. He was Head Draftsman for the firm of James E Ware & Sons, whom I have published the authorized biography of. In many ways, Short was Ware's alter ego. He went on to form Harde & Short, a glorious but short lived firm, and plateaued as the designer of golden age, Hollywood style movie theaters, becoming in effect the James Ware of cinema houses.
I have been unable to locate photos of Short or Harde. Don't give up. It took decades for me to find photos of Ware. Some advice, you may have tried already? Look to the cemetery where he is buried, oftentimes family records or contacts are available. Local historic societies? But often, the other branch of families may have material unknowingly. Good luck in your search. I've contemplated a project on Harde & Short as well. Cheers!