I wanted an art forum here, but I realised its just better sticking it in the best category you can, unless there is a better place for it your not going to get abused over it.
Lets say there was a specific forum for your needs your posts wouldnt be viewed as much, and people who wouldnt be highly interested in writing wouldnt go to that section and wouldnt see your posts and its good to get views from people dont read too much etc..
I probably seem negative toward your idea .. im not .. I just think theres more reasons against it than for.
And if you start posting such stuff, it might catch on .. its then that you think about starting a forum for it. Thats what i was told when i suggested an art section.