New Years Resolution Time: Get your Facebook Pages in shape and understand how their marketing and status reach actually works.
Visually, there is a banner area you have to work with, as well as a profile picture. Keep in mind that, if you're using the cover/banner image area to get across a marketing message, that the profile picture partially overlays it. I've seen a few that have part of their message covered because this wasn't accounted for. Same goes for using an appropriate picture for your Page profile pic. That one is a square image. Design a profile pic that is square so that it doesn't get jammed into it or proportionally thrown off by Facebook's image processing.
Profile Image: 160px X 160px
Cover Image (aka the banner image): 851px X 315px
Work with these sizes in mind and you're good to go.
I know lawn & landscape marketing, branding, and web strategy. I'm not anonymous, I just don't self-promote.