Very nice text and characters.

Everything is perfect except this:

Wǒ bù bú shì lǎoshī

Wǒ bù bú shì Zhōngguó rén.

Wǒ shì Déguó rén.

1. The original tone of "不" is bù, but when "不" is followed by another fourth tone, it will change into the second tone as "bú"

2. The initial letter of a country's name should be capitalized.

Hope this will be helpful.

Li Ying

so great!

太棒了！