I will show you how to draw eyes in different styles and emotions.
Default/Happy Eyes:
For this type of eyes, the eyebrows are usually relaxed.

Surprised Eyes:
To show surprise, the iris will be a lot smaller depending on how surprised the character is.

Upset Eyes:
To show agitation, the eyebrows are drawn going upward. Sometimes there will be a crease on the forehead.

Worried Eyes:
While the eyebrows go upward to show upset eyes, they are drawn the opposite to show worry.
