The images not utilized within an hour are deleted automatically so you must be using it at some place. As long as it's being utilized at some place it stays up in the uploader.
► When you open a file image uploader you can see the images you uploaded. If you move your cursor on the top right side of the image you see a question mark.
► Click on the mark and you can see the location where the image is being used. Click on this link displaying location of the image.
► Once you remove the image from that place it will be deleted.
► You may have to edit a post if it's being used in there directly( most probably not available to normal users). Otherwise it's in one of the albums on your profile. Delete it from that album where it is stored.
Deleting the images from an album:
► When you open an album you get :
Art . Edit Album Edit Pictures
► Click on 'Edit Pictures option'. You get two boxes in front of the image:
► Round one saying :'This is the album cover' and
►The square one says: 'Delete this image'.
► Check 'delete this image" and then hit on save button. It should work.