You will be outside of the Museum and controlling Adil.
There is a large van, if you stand towrds the rear of the van and option appears saying 'examine the hitch'. You will find a tennis ball so pick it up.
Now go to the front of the museum and climb the stairs where you will see a dog. Press
to bring up your inventory and press
on the tennis ball. to play with the dog. Repeat 3 times.
Just to note the option to locate the tenns ball may only appear once you have opened the van, put the painters clothes on and attempted to enter the museum.