I’m not a character artist in specific, but I label left and right always from the model’s point of view. Anything other might change according to where in the scene the model is located; which way it faces the camera.
This is why boats and planes use port and starboard instead of left and right.
Which arm would you raise if i ask you to raise your left arm ? Would there any difference if i’m in front of you, behind you or on the left or right side ? Or if i would talk to you over some speakers from outside of the room?
A fun answer to the fun question could be: i name them .L and .TOL… .Left and .TheOtherLeft… or .RightOrFalseLeft… abbreviated .ROFL
(But we also get into problems if the character has more then two arms…)
If you’re only looking for simple answers, this isn’t really a discussion, you could just make a poll that aside, I agree with what’s already been said- left and right aren’t relative, they have to be a constant, especially in animation. Left and right hands is the only answer that works at a production level