Choose a memory of an event in your own life where you experienced intense emotion. It is easier to write about something you have experienced, so choosing an event from your own past is a good place to start a romantic-style poem.
Write a list of words that describe the emotion you want to convey in your poem. For example, if your intense emotion is happiness, your list might include words such as joy, elation, exuberance, cheer, bliss, delight, and so on. If you are having trouble getting a good list, use a thesaurus.
Write your poem using the words from your list to describe the life event you have in mind. Do not use adjectives that describe color, texture, size or other sensory experiences. Make the readers feel what you felt rather than making them see what you saw. When Edgar Allen Poe described the death of a young woman in his poem "Annabel Lee," he did not describe the cold wind that killed her. He let the emotion tell the story: "That the wind came out of the cloud by night / Chilling and killing my Annabel Lee."
Rewrite the story in verse form, paying particular attention to meter. Although Romanticism's poetry does not have specific meter or rhyme scheme, as do sonnets, for example, the meter of the poem can many times help create the emotion you are trying to achieve. Poe's "Annabel Lee" is a good example, but one of the best examples comes from "Paul Revere's Ride" by Henry Wadsworth Longfellow. The meter in the first two lines helps create the sense of anticipation and excitement that follows throughout the rest of the poem: "Listen my children and you shall hear / Of the midnight ride of Paul Revere."
Edit your work. Choose your words precisely to create the most emotion in the smallest space. Read the poem aloud to better grasp the meter and any errors you may have in it. Have someone else read it aloud because he may put different emphasis on certain syllables than you would have expected. Although Romantic poems typically capture the spontaneity of raw emotion, they only do so after several attempts at writing.