Pictures are sometimes not that good for spotting a psychopath, they may blink they may have their eyes half closed.
You need to look at their "eyes-popping out" sometimes 24/7 sometimes 20/7 - the predatory look on their face is sometimes disgusting, but you see most normal people that know nothing about psychopathy, might not be able to notice the eyes or say that there is something wrong with them.
I wouldn't necessarily stress cold eyes, they are cold alright, but the eyes sometimes are so blocked that someone might think these guys are actually scarred of something, they sometimes look as if they scarred, sometimes they look as if they're stunned by something, or just they just have predatory eyes balls showing nothing to you but hate.
Someone, once, even told .Psychopath. that when he's nervous he rather looks scarred. Damn he was right.
here is one classic example http://i.imgur.com/VDCnlCr.jpg
ted bundy had "decent psychopath" eyes, I've seen much worse.
even if you try to fake those eyes you won't be able, I can't imagine how these guys actually have these eyes so widely open, blunt and popping out so badly for long periods of time (it must be a nerve or something triggering them) or otherwise I can't imagine how they manage such thing. I've tried numerous times and I just can't even fake it.