The guy on the right also appears in this video and is widely accepted to be the true appearance of the obscured Still Life in FF3

For credibility, this artist was credited as one of the concept artists for the film. And apparently did some concept art for the series as well, according to the Kane Pixels fandom wiki, which pointed to this interview as a source: https://www.youtube.com/watch?v=_8C0sA_bm1o