Illustration Book- Narrative story

The core implication of the story talks about building confidence. The idea is that it is not every beautiful thing suitable for everyone. The only thing we can do is to build our confidence and do not need to envy others. I started to think about using animals for the charactors. Firstly, I choose the animal which can represent the outlook is not really attracted people. Then I thought that hippo can be the main role. Its thick eyelids also make the hippo looks like it is unhappy. I want to describe it change the mood to the happy emotion.