I deleted the previous post about the prints from etsy and copyrights but I contacted every artists. If they ask me to take their prints down, I will do so. If they said "you can share them but with a watermark or using a demo version", I'll do so as well.
For my Erotic Print Art Digital Collection, the artists don't seem to mind if I post a version of their brought print art withtout a watermark. I'll then update both galleries soon, here and at MiaQc Archive.