Trying to get yourself to be stone cold and not give off any tells is a big part of poker. Now there's a site where you can see how good your poker face realy is, Rate My Poke Face has launched, a site where you can upload a poker face of yours and see how other people rate it. Or just browse and rank other people's poker face.
You can visit the site at: http://www.ratemypokerface.com/