This is my head.

这是我的头。

This is my head. I have a mouth.

这是我的头。我有一张嘴。

This is my head. I have a mouth. I have a nose.

这是我的头。我有一张嘴。我有一个鼻子。

This is my head. I have a mouth. I have a nose. I have two eyes.

这是我的头。我有一张嘴。我有一个鼻子。我有两只眼睛。