What is the author's style in A Drink of Water by Seamus Heaney?

The octave's images are filled with reminders of old age and death. In the sestet, the sonnet shifts to night, focusing on the image of the woman's moonlit water-bucket and her cup that bears the inscription "Remember the Giver." Now the woman is dead, and while the speaker once was the "giver," allowing the woman to draw from his well, now it is he that remembers and she that gives—in the form of memories and poetic inspiration.