Fun fact: if you horizontally flip an image, it will change the handedness of the model! It's so simple, but I know many people who might not think to try it! ^_^
Huzzah! Now all those right handed models can be used for your left handed characters!
Works for other activities like shooting, eating, swords, etc.
Although this is without a doubt helpful, I would still recommend finding "real" left-handed reference, at least starting out, because very often they hold paper and pen differently.
I missed this