Hi there,
Quite a few to catch up on here...
Mouth: I think the DoF works for me but the OOF mouth looks more like motion blur than plain OOF so (to me) it looks harsher. I like the concept though and it's spot on for the theme of course.
Crowd: Great colours and sharpness. Like it
Close up: Wow! That is a stunning shot. Nice composition. Did you mist the flower with water or was it already wet? I have tried to mist flowers for macro but it always looks artificial when I do it. Looks like a touch of blue / purple CA on some of the petals on the left.
Machine: Another very good shot. Great clarity and focus on the PCB. It has to be the car for me though. Nice use of selective colour really adds to it.