Above the coffins near the middle of the Underground Tour is a high arched dome, with a light bulb hanging from a long cord. Climb the cord to find the picture piece.
You will have to swim for it : the lighthouse is on Big Nate Island, not Counterfeit Island.
It is about halfway through the Underground Tour, and you can climb up the wire from the light bulb.
The underground dragon piece is under the dome in the Underground Tour. I do not know if you can get it in the morning on Counterfeit Island--I always get it at night. Anyways, you pass the dome and it's near the front. Well, if you get it in the morning it's near the front cause you took the tour, but if you get it at night it's near the back--But in the same dome! So I hope that helps. ~An Answer
Counterfeit IslandNo, Counterfeit Island is real. In fact, it'd be better named as "Art Island".
The big house on the country side.
there is no mansion on counterfeit island
You do not die on Counterfeit Island.
in the cave you get a piece of the picture, and once you have the whole picture you copy the picture on the lock in this big dome above your head, and it will get you into a secret door that leads you to the supply closet so you can sneak into the museum at night to "protect" the painting
On the Underground Tour, there is a high arch with a light bulb hanging down. Climb the wire, and jump to the right to get the picture piece there.
There is no camera as an item on Counterfeit Island.
Thinks he's cool: Big Nate on Big Nate Island. Cool but not to be trusted: Shady Guy on Counterfeit Island Director D on Spy Island
you go back on counterfeit island