Yes, I see the lines. Actually it's quite funny. It happened when I framed the photo with PhotoCleaner software. When I loaded the image from PS I realised it's a bit too big. I didn't want to go back to PS so I resized it in PhotoCleaner. Then I loaded it to the website and noticed this strange pattern. But it was too late....
I never resize pictures in PhotoCleaner - that was the only time, you see :-)
Anyway, thanks for the workshop (I like it very much) and for the nice words...