A favourite reverse tell of mine which I tend to overuse:
When the villain is staring you down for tells, do the stare (i never do the hoodie and shades thing so my face tells all) back BUT break the stare briefly after a short while by looking to the side and down quickly. Add a subtle swallow of the saliva.
Fooled plenty into thinking i was uncomfortable at the thought of a call after bluff raising all in... Of course, I will turn over the nuts when called...
Just did it in a recent hand and villian hero called with TPGK when i had a FH on a semi wet board...