The only negative is on 68, in that there is a lot of "activity" going on between the exploding links and the puzzle pieces... and there appears to be a big piece of link at the top right of the left-side cuff that adds to the confusion... may be cleaner with the one link...
I don't think I'm allowed to suggest you do a link like other designers have... perhaps it is the loop that the link is attached to that is the problem... it needs to be very clean and obvious, even in thumbnail size...
Please give us a version with larger/more "modern" looking links, not quite so busy where the links meet the cuff... I LOVE the puzzle pieces on a single cuff.