What can I do or add to this dress to make it more pin up?

if you're going for a rockabilly pin up look simple rhinestone earrings would be just fine. Make sure to wear flat red lipstick...i recommend Ruby Blue from MAC or Rouge from Sephora, both $13 and of course the cat eye liner is a must...and for the hair i would recommend getting victory rolls done or doing them yourself by learning how to by watching a tutorial on youtube. Well hope this helped :)