As I threatened, I contacted Momoko Sudo about that puzzling drop of epoxy that she posted on her blog and she was happy to reply. She has posted a few comments on my original posting - the long and short of it is that the "wrinkles" are not wrinkles but are the arise from color variations in the resin.
She also added a new entry to her blog about the whole matter. I really recommend you read her posting as she has some new insights not only about her role as an artist, but also about how puzzling the drop can appear to her too if you look at it anew. Her own words say it best, so check them out.