The description of the 2019 gay man flag can be found here
The bi flag has been sourced to [this webpage https://web.archive.org/web/20120204070907/http://www.biflag.com/Activism.asp], more info can be found there.
1 - https://www.deviantart.com/pride-flags/art/Biromantic-607943792

2 - https://gayflagblog.tumblr.com/post/186181118619
1 - pride-flags on deviantart

2 - gayflagblog on tumblr