Queen. Since that's the title of the person, it needs to be capitalized (the same principle applies to other titles: Doctor, Judge, President, etc.)
I think its an Idiom. I don't see like or as. So no simile. I don't see he is something like a marshmallow. - No metaphor. I also don't see a non-human thing doing human things- the grass was dancing in the wind. My answer would be an idiom.
Hope this helps!
Answer:
can you link a picture to section 18 please
Explanation: