I went and looked at what Hubpages has listed as your best hub. Of course that will change, and often does.
Okay, just from a brief look at this hub:
You need to title your images with a description of what they are containing the keywords...i.e., the words that someone would type into a search engine to find the exact hub that I'm referring to.
Title the map you have there as well with the proper keywords - that, the titling of capsules...is basic on page search engine optimization - and it will improve your traffic and earnings.