0 photos on ipad but when connect to itunes it says 4.8GB of storage used by photos ?

When i connected my ipad to itunes it says 4.74GB of storage is being used, I thought this seems like alot as I only had about 15 photos and a couple of short videos. So I decided to remove all photos and videos, I have removed photos and videos from Photos plus the 2 apps that my daughter had downloaded, Videostar and picollage. So no photos or videos on my device but nothing changed on itunes, I decided maybe some images in emails or text/imessages, so deleted all text/imessages and deleted the whole email account. Still nothing has changed in itunes. I have done soft reset (home button and on/off switch) and re-synced with itunes but still it is saying 4.74 GB of storage used on photos. I have been in every app, don;t have any social media turned on and I can't find any photos or videos anywhere so why is 4.74 GB of storage saying it's being used by photos ?

I see others seem to have had this problem though not to the same extent of storage being used but there doesn't seem to be many answers provided for a solution apart from try a soft reset !

Help please, it is driving me mad.