For me its most likely:
1st Cowgirl/Desperado, female: got gloves, boots and looks like a female hair cut
3rd Cowboy/Desperade, male: gloves, those star shaped things on the boots, holster for pistol on the hip and cigarette
definitely a pistol user für scout which would be welcomed
it’s harder for the other 2, so i assume:
2nd female heavy gunner: could wear armor, but looks light compared to the male coutnerpart, wears a musket on the back but i think this class can use either musket or cannon, female design fits musket more
4th male heavy gunner: wears more bulky looking armor, hair cut looks more male than female, by design should fit more to use cannon than musket but could use either of them of course
EDIT: I am so bad with links making them show the pic behind then, sighs…