Are nature, dreams and visions, imagination, religion and spirituality, and the supernatural features of romanticism? Because I have to describe three features of romanticism found in a poem, and those are the features I found online.

I think what you list here is only part of what romanticism embodies. According to the American Academy of Poetry:

Romantic poets cultivated individualism, reverence for the natural world, idealism, physical and emotional passion, and an interest in the mystic and supernatural. Romantics set themselves in opposition to the order and rationality of classical and neoclassical artistic precepts to embrace freedom and revolution in their art and politics.

Here's the whole article:

http://www.poets.org/poetsorg/text/brief-guide-romanticism

I am referencing one of my favorite texts that relates very closely to your question

In the works of Smith, a predominant concept is the distinction between
opening and closing. Sartre’s critique of cultural narrative implies that
sexual identity has intrinsic meaning.

Thus, in Chasing Amy, Smith reiterates cultural precapitalist theory;
in Clerks he denies cultural narrative. The main theme of the works of
Smith is not theory, as Derrida would have it, but subtheory.

However, the premise of the neodialectic paradigm of reality suggests that
art is used to entrench sexism, given that sexuality is distinct from language.
Marx uses the term ‘the deconstructive paradigm of expression’ to denote the
role of the observer as participant.

Yes, nature, dreams and visions, imagination, religion and spirituality, and the supernatural are indeed features commonly associated with Romanticism. Romanticism was an artistic and intellectual movement that emerged in Europe during the late 18th and early 19th centuries, valuing individualism, emotion, and the sublime.

To describe three features of Romanticism found in a poem, let's use William Wordsworth's "I Wandered Lonely as a Cloud" as an example:

1. Nature: Romantic poets often celebrated the beauty and power of nature, seeing it as a source of inspiration and spiritual renewal. In this poem, Wordsworth vividly describes a field of daffodils and the effect it has on his mood, emphasizing the beauty and joy he experiences in the presence of nature.

2. Imagination: Romanticism placed a strong emphasis on the imaginative and creative powers of the human mind. Wordsworth's poem reflects this feature as he uses vivid descriptions and sensory details to convey his experience of the daffodils. He allows his imagination to transform the scene from a mere observation into a profound emotional experience.

3. Emotion and Dreams: Romanticism sought to evoke powerful emotions and capture the depths of human experience. In "I Wandered Lonely as a Cloud," Wordsworth expresses his emotional response to the daffodils, using them as a symbol of joy and hope. The poem transports the reader into a dream-like state, where thoughts and feelings blend together.

By identifying these features in the poem, you can provide a thoughtful analysis of how the poem embodies the ideals of romanticism. Remember, it's important to support your analysis with specific examples from the poem itself.