文笔

His writing is neat and unaffected.

She talks well, but her write is not up to much.

Her writing features an exquisite style.

She is good at writing/writes very well, so let her draft the annual report.

have a fluent/ready pen

have/wield a trenchant pen

write easily and smoothly

write in a lively style

be simple and straightforward in writing

in a bright style

write in an easy and fluent style

write in a concise style

difficult and dull style

write coarsely