Overall, Your forum looks prity nice. Brown isn't my colour but you seemed to have worked with the colours and used them well.
The logo imo is very mediocre at best, the text looks jaggy as does the overall appearance of the image, the slogan could be more crispier and a little more prominant. Overall it looks like the image was cropped badly resulting in a logo that doesn't stand out well.
Same rule applpies to the forum status icons. They look mediocre at best and if you look closley, the curved areas of the images look jaggy and look as if they have been cropped resulting in the rough edge.
Button set edging looks jaggy, I'm assuming you saved them as a fully transparent image (bad if the buttons contain a curved edge) which yours do. Saving them to an appropriate matte to compliment the background to which they are applied onto is your best bet and I gurrentee that the edging on the buttons opting (for the method I suggested) will give you a far better result.
Example: Look at the screenshot (below) and tell me which images look better? This will ensure that
all images on your forum will give off a more pleasant appearance.
With that all said, With a little TLC I'm sure the feel and look to your style will benefit from the suggestions I put forth.
I wish you all the best for your site.