ok first off whatever red you’re using on the suit?? match it to the lipstick. because tony stark in full iron man is not going to be rocking neutrals and sensible makeup. if he wanted sensible his life support wouldn’t look like a hot rod.
shimmery gold eye shadow is your friend, you can smoke the crease out with a brown. pair it with black winged eyeliner sharp enough to cut his enemies and subtle black smudge under neath. sexy bedroom eyes that also say roll over and get the fuck out afterwards.
i think a key thing to remember is that tony is incredibly intentional with how he presents himself and is also fun and gaudy. you want to have a lot of fun with your makeup and not tone is down (unless we’re talking workshop tony then sloppy bun and chap stick are the way to go tbh) but also take time and make sure to get the lines of your lines and lips sharp and as close to perfect as you can. use a lip liner first if you’re worried about smearing.
red and gold should feature prominently, but try to keep it focused on eyes and lips so it’s not overwhelming.