One of the greatest downed poses ever belongs to Rebecca from the Neo-Geo Double Dragon fighting game. She looks badass in victory as expected
but also does so in (temporary) defeat.
Despite her health meter having run out, which is usually assumed to lead to a state of unconsciousness in these types of games, she continues to hold her head up and make a fist with her right hand like a trooper. Even 'knocked out' Rebecca is still strong! So tough and inspiring.