Are these videos out yet? Because if there's an opportunity to alter anything I'd suggest adding a white outline to the text on the Cortés one, and I think a lighter purple (possibly on black?) on the Pizarro one. Would help with the colour contrasts there.
First video is out, second one today or tomorrow. So far only the first is used as art for the videos, as a thumbnail. The topics in the other art haven't had videos of them yet. I'm not sure if we will use this at outside the FB group.