Creating a poker face

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so i've been playing for 2 years and recently online a lot but i still have a problem keeping a poker faces at important times.

Basically when I just flopped a monster sometimes I can't help but smile and while this doesn't really matter much with the most players at the small stakes tables in B&M because they dont look around much, i figured I need to nail it down eventually.

Any tips or will i eventually be able to control myself and my poop eating grin

[img]/images/graemlins/grin.gif[/img] (me with rockets)