Personally I hate it when people put script on pictures. It ruins the picture and most of the time the text is hard to read. It would interest me if it had the quotes on the back. I wouldn't have even read all of these except the first quote caught my eye and was easy to read.

The logo at the bottom I don't mind. Especially if it was a touch smaller. It could be a good advertisement.

The post card idea appeals to me though. You might call some museums to see if they sell enough to justify the effort.

Just one guys opinion.

I wish you well on your venture.