Zhè wèi shūfǎjiā de bǐyì shì diǎnxíng de miánlǐtiě.
This calligrapher's brushwork is a textbook example of iron wrapped in silk.
Tips
culture
A technical compliment in calligraphy criticism: strokes should look 柔 (soft) but hide 刚 (steel). Similar in spirit to 绵里藏针, which is more often used for people with a deceptively gentle manner.