a clear photo would help

Well, you don't have a photo of your painting, but I did find an artist with the name you stated - here's a link to a website about him - http://www.kettererkunst.com/bio/PaulKleinschmidt-1883-1949.shtml

do you have a close-up of the actual center photo/drawing? Or can you give us a description? That would be a big help in identifying it. Also are there any words/names etc. printed anywhere? I do...