Good shout Ivor, lots of good female gunslinger art in the Law Dogs. Several examples there I can send my friend, like Lucy Clover basic and Exp, Deborah West, Sister Mary and Wendy (who is a good recommendation too, but I don't think ever became Sheriff? Abrame Groethe gave her the badge so she could seek out the next sheriff, which was Blackjack according to the Epilogue). Several in Sloane too.
I was trying to find a good picture of the "Gal with no Name" from the RPG, as one of the purest mirrors of a film dude, but didn't have much luck in the newer RPG books. There were some of a female harrowed gunslinger in white but I couldn't remember if she was too decomposed to be the "Gal with no Name".