Try going into the 'applications' folder and look for 'Files', open that and choose 'File Folders' then 'Media Card' then 'BlackBerry' and open the 'Pictures' folder. Once you're there press the BlackBerry symbol button and a menu will come out. Choose 'Show Hidden' and just look for the picture.
You can find your hidden pictures by going into Applications > Files > File Folders > Media Card hit the BB key and 'Show Hidden.' To recover lost photos from Blackberry, you can download a Photo Recovery program to scan the storage device where the hidden picture is on.
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