I like it. It is very clean and easy on the eyes for long reading sessions. You have a tremendous amount of activity...great job there
I also run a writing site...went for a bit of a darker skin myself but still easy on the eyes. The last thing you want to do is cause unnecessary eye strain....it will drive away visitors very quickly. Multiple skins is always a good option if you can support them.
My only complaint is more of a personal one. Forums do not make good fiction archives, at least in there default setup. Chapters get lost in the reviews and the reading flow gets disrupted for anything over a single chapter. I have seen setups that use different skins for the story pages that helps to resolve this problem...it keeps the chapters together while displaying the reviews without getting in the way.
However, if none of your members are complaining I would stick with what you have
On a side note, I am always looking to exchange links with writing sites. Shoot me a PM if interested.