Gallery doesn't support to 'suggested ghat there are several photos which are similar and suggested me to delete the duplicate or similar photos', If you use other app to delete photos, that cannot be recover.If you use ASUS Gallery to delete photo and select to move to Trash can (un-click Permanently delete), please into the Trash can page in drawer > click spinner to change storage > select the picture > click the recovery button (like circle) on action bar.