You can see the proof of delivery on the Royal Mail website.
If that is your address on the photo and the parcel has not been delivered to you, or a safe place, or a neighbour, contact Royal Mail and ask them where the parcel is.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)