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.

Normal Printing:

Back View and Inside View

Front View and Back View when the brochure is closed

Final Artwork:

  Overall Design 

 Inside of the Brochure

 Back View when brochure is closed

 Front and Back View

 Front View