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Do this, without becoming theatrical. If not, it will give you the clear idea that you are playing a meaningless and logical game, and that way it will be easier for opponents to be able to understand what you are trying to do.
Yeah, I forgot to add that you should look natural when you are doing a poker face because a bad one is a good tell that you are hiding something and makes you easy to predict. Another one I think you can do is play risky all the time but that is if you can handle the stress of playing risky.
Poker face and make it looks natural, that's truly hard to predict what encircling inside your minds.
Lots of gamblers practice this and make it realistic, they use this skills to take advantage with those gamblers who played against them,
if you able to practice this and managed to make it more realistic from time to time, you really got the opportunities to collect winning stats each time you made a call.