I guess ya'll already got enough answers now but if you want to make him look even bigger and intimidating, you can take shots of him from very low angles on the ground.. It makes the person looking at the picture feel like they're very small and can feel a little intimidating too, observe:
https://citywonders.com/media/11640/low-angle-shot-eiffel-tower-tour-list.jpg?anchor=center&mode=crop&quality=65&width=950&height=600
Vs a straight on shot, which one looks bigger to you?:
https://upload.wikimedia.org/wikipedia/commons/thumb/8/85/Tour_Eiffel_Wikimedia_Commons_%28cropped%29.jpg/1200px-Tour_Eiffel_Wikimedia_Commons_%28cropped%29.jpg
Similarily, you can do the exact opposite to make people seem inferior or smaller, like they are being intimidated by someone (using a high angle shot, as if ant man is looking down at them):
https://image.slidesharecdn.com/filmtheory-141016000457-conversion-gate02/95/film-theory-shot-selection-storyboard-and-montage-12-638.jpg?cb=1413418013
(I'm pretty sure that picture is taken from someone's media homework or something but whatever lol)
P.s sorry these pictures are really big?? Wasn't aware when I put them in but yeah