When user try to share my page on google plus, google gives suggestions for some extra images which I don't want. I wan't only one image to show up in share windows. Is any way to tell that? I already use og:image tag, but it doesn't help.
The same problem is when Google Chrome Pin it extension is used for Pinterest.
Although Google+ generally respects the "og" tags, it frequently has trouble doing so. What works much better is to use Schema.org microdata. You can find a configuration tool to help, and some very brief documentation, at https://developers.google.com/+/web/snippet/.
More information about Schema.org markup is available at https://support.google.com/webmasters/answer/1211158.