I chose this five characteristics of romanticism:
first of all:
Imagination. To do a romantic poem you need imagination
second:
Emotion. A romantic poem need emotion because the emotion you can express it with the words of the poem.
Third:
Nature. All romantic poems needs nature because the nature relax you of the modern world.
Fourth:
Symbolism. Romantic poems need symbolism to intrigue the reader.
Fifth:
Pastoral life. Some poems has a pastoral life that connect the reader with a simple life.