After getting the feedback:
I decided not doing die cut. I placed my elephant at the front of the brochure. The first and last pages give a sense of continuity. The elephant is blowing the bubbles and the bubbles are flying to the last page. Also, I placed the piano keyboard at the inside and outside of the brochure to show the continuity. I cropped the images into circle and placed the images on bubbles. Elephant is blowing the bubbles over the brochure.
Back View and Inside View
Front View and Back View when the brochure is closed
Inside of the Brochure
Back View when brochure is closed
Front and Back View