SilverStar17
Super Freak
I don't know about other figures but the slightly open mouth for Luke is fitting since Hamill spent a better part of the movie like that. The lighting in that pic makes it look a bit wonky but the promo shots are perfect.
My sentiments also. I did a Google image search engine of "Luke Skywalker Return of the Jedi" just to get a rough idea for possible poses and 75-80% of the photos all have him with some sort of teeth bared expression.
I think the expression HT went with on this figure is very suiting.
At the moment I think this one is the winner: