Writers always use such phrases and words that do not tell us directly about what they mean but always give us an indication of the meaning. Such words or phrases are used to trigger our own imagination in painting the picture that they mean. The use of such images in the poem is the following: mouth like a fireplace, chimney for a nose, brave as a barrel full of bears, brave as a tiger in a rage, went at the pirate like a robin at a worm, etc.