Nekoshiro - researching process

As one of my task is to create the lecturer, I have to research for creating the image of this lecturer. THis is a cat named Nekoshiro. And we will designed the 3 different style of Clothes for Nekoshiro:

1- 1 formal costume for the Introduction and the Quiz
2- 1 normal style of clothes for the 7 lessons, they will have different color
3- One for the lesson of Conversation

And this Cat will have three main emotion apperance:

1. Serious face
2. "evil face" to notice user of sth
3. funny face - for congratulation

And I have researched for several style of illustrating a cat:








The formal suit will somehow like this:


This makes me think of an "evil" face for the cat: