Go right, enter the main gallery, and climb onto the overhead light by The Scream.
(This is what is designed to occur in the game.)
You hide behind the furniture.
If on Counterfeit Island, hide behind the plants and statues.
You go to the scream and hang above it
Slip out the door to the left into the main gallery and go to the painting (The Scream).
Once you duck past the Security Room, and hide behind the statues to avoid the lasers, exit through the doorway at the right and go to the painting The Scream in the gallery.
get up to the statues and crouch :)
Hide behind Plants and Statues.
You go down and go to the scream.
on counterfeit island in the museum when there are lasers you cant turn them off. you hide behind the statue's
you hide behind the statues.
Duck behind the statues, then move right when the lasers move away. When you get close to the door, go out into the gallery.
There are no snowballs on Counterfeit Island. (see the related question)