Brain Test All-Star Level 272 That bookcase hides something Find it

Need the answer for "Brain Test All-Star: Level 272, That bookcase hides something.

By Emir Lajev /
Question
That bookcase hides something. Find it.
Hints
Hint 1:
The painting behind the girl is the hint.
Step 1
Answer
Drag the girl aside to see the painting on the wall. Now, swap the books to organize them by the colors of the picture on the wall.