There is a very useful option for us to inform Artstack about bad material:
1. GO TO THE BUTTON "ARTWORK INFO"
2. CLICK ON "FLAG AN ISSUE WITH THIS ARTWORK" LOCATED AT THE BOTTOM.
3. CHOOSE "INAPPROPIATE CONTENT".
4. MAKE YOUR COMMENTS IN THE BOX "DESCRIPTION"
5. PUT YOUR NAME AND EMAIL.
6. SUBMIT THE REPORT TO ARTSTACK.
This is my proposal and is the way I´m going to proceed.
Regards and good luck to all