One cautionary tale for you.

Justpaste.it is a page that offers exactly what you do - free, anonymous sharing of formatted pages, with images and all. Accessible at Tor, very lightweight.

Because it was so easy and anonymous, it started being used mostly by Islamic State to share their propaganda; so much that they needed to remove the "most popular" feature (as it was always either beheadings or other propaganda).

https://en.wikipedia.org/wiki/JustPaste.it

edit: ah, you have credit card info down. So it's not really as anonymous as justpaste.it, as the ISIS guys won't share their credit card. OK that can work.