I like the logo, breaking the rules, it looks original.
You can work a little on the REGISTER banner, the small blue text is hard to read.
The color for members is again hard to read and you can make the Moderators color a bit darker to fit the site better.
Also work a little on the topic icons, make them look more like the rest of the site.
This is all I had saw that would require changing.
Otherwise, the site look great. Good work mate!