How to recover pictures on gmail account
You may try some picture recovery tool, here's a good onehttp://goo.gl/3RHIa
Deleted mails from your Inbox only can be retrieved from Trash. If you deleted the pictures from your inbox, just check in your Trash folder, you should find them there if it has not been long since you deleted them.
If you took a picture using your smartphone and you had the google + app, it might be saved on your Google + account.
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