Not totally logical but enough to get you to where guessing is easy.

Don't understand. I solved the puzzle but it tells me "invalid answer".

Thank you.

Umm, ...no: actually, that is my card: http://www.hanjie-star.com/picross/queen-of-spades-14437.html ;-)

A little guess work with overlap but I figured it out :)

Nice one :)

There are two ambiguous pixels. If you have any single pixel floating in space, delete them.