For Christians, hanging a picture has no special significance. This is to show their faith. If it is safe, it must be superstition. A photo can't be safe.
Let me explain what I think this painting means.
The cross shows that Jesus Christ came into the world in the incarnation and was crucified for our sins and saved us from them. We believe that he is our savior.
Grapes, the Bible once compared God's home to a vineyard, and a bunch of big grapes showed the richness and sweetness of God's grace.
As for the tiger you said, you should be mistaken. Maybe it's a lion or something, because there is no mention of a tiger in the Bible.
If it is a lion, cows and lions refer to the four creatures around the throne of God.
Rev. 4: 7 The first living creature was like a lion, the second like a calf, the third like a man, and the fourth like an eagle.
I guess Christian is confused, too, or he wouldn't have insisted on not taking pictures.