After getting the feedback:

I decided to place my elephant on both sides which mean when viewers open the brochure, they can see an elephant. When they close it, they also can see an elephant at the back of the brochure. I placed the piano keyboard on both sides (inside and back of the brochure) to make it looks like fluently. Also, I focused on bubble shapes. For instance, I cropped the pictures to circle and placed them on the colourful bubble.

 Front Brochure Design

 Inside of the Brochure