The first sentence is correct and the second sentence is a fragment.
I’m going to try to give this to you via comment section because it includes too many words.
(Now, this is something I pulled off the web. You could turn this in, but I don’t recommend that. Just read over this instead of the actual book if you don’t have enough time, and rewrite some of it in your own words, or rewrite it all yourself based on this.)
They might have not been cool and calm, you didn't add the story
Sorry to disagree but I think the answer is flower-tops. The poem is about nature yes but the term heads seems to refer to the flower-tops as the topic was daffodils. This is personification as if the daffodils were humans that could dance.
