I'm also interested to know what information people generally include, and what they leave out...
I use my wife as a guide. I add in a lot of information and then trim it down for space constraints, and ask my wife if she understands what this stamp is about. Since I'm Ukrainian, the top makes more sense to me. She is Irish, so hew knowledge of Ukrainian history and culture is much lower than mine.
For most of my descriptions, I find the Wikipedia article, if one exists, and borrow the first sentence or two. That's usually enough to explain what the stamp is about to people not familiar with the culture. Sometimes I have to go to Ukrainian Wikipedia, which is a lot of pain. I'm fluent in Ukrainian, but I am fluent in 1940s Ukrainian, because that's when my parents left Ukraine as kids. So, modern Ukrainian, I probably only get about 75-80% of, if it's West Ukrainian. If they're using Ukrainian that's spoken around the capitol city, Kyiv, then I get maybe half of it. Then I have to call my parents to help translate into US English.