I love this image; I get a case of the giggles every time I look at it. Your characters' faces are so evocative. I have to wonder what it is they're looking at that it could cause a universal facepalm. (And here I go chuckling again. :-] ) As others have remarked, one of your great strengths is your ability to give your characters such emotions. Thank you for sharing it with us.
OH!!! This almost looks Steampunk-ish so someone could have been riding a new vehicle machine (aka Steampunk motorcycle maybe) and then they just crash and burn in a humiliating yet almost painful looking way! so then they all have that look, the guy with the goggles could be thinking "That person, just crashed my bike" and Ciril is more or likely a closer friend or relative of the person and so thats why he's doing the facepalm!!!
I think they look really nice together with that background, don't think they ruin the mood, just finding the placement of that green planet ever so slightly annoying - looks like a halo. Liking the facepalm.