Seal Engraving: White and Red Seal 6-Piece Set

My father, who carved these, has passed away. The remaining albums lack explanations, so it's unclear whose poems these are. They are likely words from the Han Dynasty poets Li Bai, Du Fu, and Wu Xizai, whom my father favored. The seal carving is well-balanced with a dignified script. All are carved on surfaces slightly less than 2 cm, with lengths ranging from 2.5 cm to 5 cm, making them miniature versions.