None of the work you’re posting is your own. You are not crediting the creators and passing it off as your own, accepting compliments on the art, and using it to enter contests.
You ask me not to downvote while posting two new completely stolen items of content.
I do not believe it is a simple mistake or misunderstanding on your part. Other accounts you have control of have participated in the same behavior, been caught and blacklisted from contests due to plagiarism.
I realize you’re just trying to make money, but this is not the way to do it.