It's interesting to me that this watch face design, and some others, seem to be going back to a skueomorphic graphic. It's subtle to be sure, but it's definitely emulating a real physical watch, made of metal and mechanical parts.
I think the Watch is the one Apple product where skueomorphic graphics should be encouraged. My favourite faces are the traditional looking analogue ones and while they shouldn’t copy specific watch faces from other manufacturers there is nothing wrong with taking design cues from classic watches from the past.