T1C was solved before this image was released.
Rob posted the new image with the following caption:
Hi all.!
We know you already solved this tier, so you don’t need any more clues… anyway here his a small little thing that you apparently don’t need… ._.
An identical copy of the image was immediately posted to the official-art channel:
No clues have been found hidden in this image. AFAIK Namatama images with transparent backgrounds don’t contain clues.