How do I get the file path of an image in Spotlight?
Select the picture and then hold down the command (apple) key.
If you're not running Yosemite, the shortcut is: CommandOption

The Path'll show at the bottom of the spotlight window. It's not scrollable, you might just be able to see part of it.

Or,double click on the Spotlight result to open the image, then right-click on the image windows title.

If you want a copyable text version of the path, just drag the icon next to the window title into a Terminal window.