when we are saving image then where it image will be save.
see screenshot : http://awesomescreenshot.com/03c60svud1
Actually I want to show this image on thank you page so please let me know ASAP.
Do you mean saving in the designer:
Or where the images are stored when a product is sent?
Saving in the designer: In the browsers cache.
Once the product is sent to you: If you have the option save on server active, in this folder: ..\wordpress\wp-content\uploads\YYYY\MM... . You can also get it via the oder viewer.