So freaky and stylish! Great piece! 

In which case, some suggestions:

Think - I think you should remove the whole brain in the first one, it is hard to see that he's actually missing just his frontal lobe. This might make things a bit clearer.

Talk - Right now it looks like he's in the middle of saying a word. Why not cover his mouth with some kind of gag, or stitch up his mouth?

Hear - Make the ear plugs much more visible (you still do have an extra colour, if you're going for 12 colours per stage)

Reply - Perhaps the irony needs to be clearer here. I think you could try showing a bunch of symbols to indicate that he's swearing. Or, in fact, why not something like your avatar, a speech bubble with a skull and cross bones icon?

Indeed! your best ever piece.

Looks great

Thanks for the nice comment...

Actually this piece deals with a "review" of common known phases of communication. This means that the illustration means to create a new perspective on how communication really works in modern social life: the thinking phase is empty because some people think like they are lobotomized. The talking phase is consequence of the first one: empty, uncertain or sick words and most of the time no words... Than the receiver have to hear what the speaker had produced, but there is no acceptation, just closed mind full of dangerous thoughts. So there's the last phase: the feedback. No good thinking, no good talk and no listening make the reply blind and means the beginning of an useless contrast.

That's an "odd" communication, even if part of usually studies about general communication. So I'm fine with those having difficulties understanding the link between the banners and the faces. Maybe they're not fine with me :D

I hope that my crappy english was enough comprehensible.

Stylish. IMO your best piece so far. Agree with Lazer though - you should definitely try improving the clarity of each of the stages.

It's all very stylish and cool, but if not for the letters above faces I would never know what they represent. For instance, I'd thought that thinking is when one's mouth shut and eyes suggest for inner concentration, and talking happens with open mouth.