I don't write poetry per say, but your hub score is derived from content and a good variety of module use. The score will rise as you get visitors, but a lot of that activity comes from your activity in the community, such as this.
The learning center is a good place to get some specifics on those modules that hub pages equates to a good hub. your poem may be short but you could add some other text pictures and tables with related information that may make for a better experience for any viewer. Everyone likes pictures, hub pages prefers you to use your own, but if your use someone's picture make sure your name the source.
There are a lot of tools that will help your hub scores and your profile score, some that I have started using are inter-linking your hubs and the title tuner. Go to hop some hubs to learn how to interlink, this is a good traffic source as well as the title tuner, it suggests words to add to your titles that can bring more traffic.
Just some thoughts, anyway, hope this helps. Blessings::)