No one but the experts was able to realize that the painting was an imitation. It greatly resembled the original

It was hard for the ordinary people to judge between the fake painting and the real one, but not for the experts.

It in obvious that only a person with great talent could fake a painting so successfully.

It was almost impossible for amateurs to realize that the painting was not authentic, though the experts could judge it quite easily.

The painting looked so much like the authentic to one that only the experts could tell it wasn’t genuine.