Logo is incorrect size

My logo just refuses to resize to be larger. It's supposed to fill a larger area between the tag line (Wonderfully nerdy....) and the "Back to Artists Alley" line. Jude took a look at it in the chat, and I've looked a while on my own for a solution. Support access is granted. I've attached a bigger logo, if it's needed (Jude said the one on there couldn't really be resized). http://www.artistsalley.net