What is the poet's mood?

In the evening, after a heavy rain, the sky was slightly bright, and the sun smiled through the clouds. At this time, a figure appeared in the vast twilight. He's a poet, Lei Zhen.

The poet walked and came to a small pond. On the edge of the pond, he saw green grass. There are many unknown wildflowers scattered in the grass, and crystal dew rolls between the young leaves of the wildflowers. There are many small fish in the pond. Some are spitting bubbles and some are playing. ...

"Oh, the sun will go home soon." The poet said to himself. Look! Half of the sun's face is getting smaller and redder, and the "half face" is hidden between two mountains, as if it were caught by them. This scene is reflected on the sparkling pool surface, rippling with the cool little halo on the water surface ... It's unforgettable!

Suddenly, there was a flute in the nearby Woods, and the poet went to look for it. Under a big tree in front, a shepherd boy with two pigtails is sitting on the back of an ox, holding a piccolo in his hand and playing a tune that is out of tune. Until the lovely figure gradually disappeared, the melodious flute was still rippling in the forest.