Thick lips ... and regular. 

This shape is square and flat... 

Only the corners are clear and flat...

and not pointing down. It makes others feel lively and cheerful.

 

People with a square mouth are typically lucky individuals who can find success and happiness in all areas of life. They are intelligent, educated, capable, curious about the unknown, and eager to learn. No matter what they do... They are loyal, respectful, honest, tolerant, trustworthy, and well-liked by all. They tend to enjoy wealth, status, longevity, and prosperous offspring. They are most fortunate in old age.