The will not allow any people of any celebrity on these stamps. If you want to get Bukowski stamps through, you need to sneak them in. Use a photo from his wedding, or late in life, but not easily recognized. I had a friend get rejected a bunch of times until he was able to sneak one thru.
Imagine if they let anyone on US postal stamps. People would put Ted Bundy, Hitler, Manson on them.
This is what you CANNOT do, per the website:
To upload, order for print, or otherwise transmit or communicate any material that depicts celebrities or celebrity likenesses, regional, national or international leaders or politicians, current or former world leaders, convicted criminals, newsworthy, notorious or infamous images and individuals, or any material that is vintage in appearance or depicts images from an older era;
BIll