Answer:
The differences between these three elements are:
Poems explain the feelings about the author about the topic, and his ideas about it.
Descriptions use stylistic devices to represent and explain the perception and understanding of the author about a certain object or topic.
Paintings, represent an idea related to an element or object.
Explanation:
The reasons for this answer are just two. First of all, depending on the material, graphic, or literary. The author will employ different tools to create them. And even when they can be created with the same tools, they will have different purposes like the poem and description. Second, there are creations like descriptions that don't express feelings and base themselves in reality. Unlike poems and paintings that can communicate something imaginary.