These are my five important characteristics of Romanticism:
1- Imagination. It is the most important characteristic. It´s the center point in the poetry. Imagination take us to all in poetry.
2- Emotion. It is also one of the most important in poetry because you express emotion throughout words.
3- Importance of nature. The nature is a respite of the technological and unreal world we live now. And that makes it an important characteristic because it separates you of technology.
4- Pastoral life. The romantic poetry tries to show you the problems of life in a simple and easy way.
5- Symbolism. The symbolism is a way of telling something huge in a small way. Is the way of obtain different meanings of one expression.