Words or phrases that express how things look, feel smell,sound or taste is a poetic technique called 1)Metaphor
2)Simile
3)Personification
4)Imagery

4. Imagery

Explanation:

1. Metaphor - Comparing 2 things without using like or as. So it is not 1.

2. Simile - Comparing 2 things with using like or as. So it is not 2.

3. Personification - Giving an object human like qualities. So it is not 3.

4. Imagery - Visually descriptive or figurative language, especially in a literary work. So it has to be 4.