I'm liking the attitude that the slight twist in #9 gives, whilst its asymmetry retains excitement. Not entirely sure on the finish though, the orange tips don't seem to stand out. Maybe it is the wrong pink.
Xcerlow, I would like to see your #10 in orange rather than green.
#16 has got it right with the black and white. It needs to be very clean block colour, outlines and fine detail wont show up in many situations.