Correct

命笔

/ mìng bǐ / 
Strokes

Example

As a Verb

set/put pen to paper; take up one's pen;take up one's writing brush

1
Xīnránmìngbǐ
欣然命笔

be happy to start writing; gladly set pen to paper

2
Mìng
命
bǐ
笔
shūhuái
抒怀

set pen to paper to express one's sentiments

3
Mìng
命
bǐ
笔
pēngjī
抨击
shèhuì
社会
hēiànmiàn
黑暗面

take up one's pen and write to denounce the dark aspect of society

4
Mìng
命
bǐ
笔
jíshū
疾书

write down as inspiration dictates; write down as feelings dictate