The default email notification setting is for you to be sent a notification whenever your message wall or any message wall linked to an article you follow is changed. So you got a notification because you've edited my talk page before. My Preferences -> Email to turn it off.
When you uploaded "File:1.jpg", you overwrote an unrelated older image with the same filename. To avoid this, it's best to use a more descriptive filename, like "Woodsman1.jpg".
