AI generated image with a kangaroo and fireworks was here:

https://bitcointalk.org/index.php?topic=5422832.msg61524279#msg61524279

Preview of image  is broken now, but you can see it here, in quote of lucifur:

https://bitcointalk.org/index.php?topic=5441776.msg61850686#msg61850686

About reuse of own artworks: obviously this is prohibited. If we all spam old art works in the hope that they will be evaluated in new contests, then this will not carry any creativity. A new competition means that you need to make new art. And it doesn't matter who spends how much time creating their art works. Only the end result is important.

Thank you taufik123 for your attentiveness and upholding the originality of our favorite art contest.