Wow! You have a great looking skin. Here is what I am noticing.
Firstly, the bold text for the titles of the forums really doesn't match the theme. If you want to keep them forest green bring that into your design somewhere. Then at the bottom, all of the area talking about who is online, looks really busy. You need to lay low on all the colors and normalize the font a bit to match the rest of the site.
The other thing which was a bit annoying was the fact you can't click the pictures to view the forums. Once again in the sub forums the main problem is the business of all the colors. The green and blue titles don't match the site.
Hope this helps. You have a really nice looking start.