The app needs to scan EAN barcode and then take a photo with the smartphone camera.
Then the barcode info (EAN product number) has to be automatically the name of the photo.
1) shoot a photo with the smartphone camera in-the-app
2) scan barcode
3) it shows you the EAN product number
4) that EAN number becomes the name of the photo shooted at 1st step
I Think it's very easy and clear.
No graphic needed, nothing of nothing, just these simple features.