A watermark can be something like the EPCOT logo in the art work or the X you saw on the picture for the other site.
Also when it comes to simplicity, your logo should explain what you are. You shouldn't need more space on the header to tell people what you are. I would recommend to find a picture of a Disney Park without any watermarks and choose a theme that allows you to make the whole front page that picture, put a transparent version of the logo on it, and then have an enter button that allows you to access the whole site.
I hope that helps
No need to be defensive, I'm just trying to give suggestions to make this communities web page look sleek, professional, and modern
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