Well when I write a story, the inspiration usually comes from one of the many manga I've read. It can also come from video games too. In fact, the series that I've been writing on Deviantart, has parts in it that were inspired by Kingdom Hearts.
As for my art, usually my inspiration for my art comes from either what's in my head or whatever I may see online. If I see a pose that I think would be fun or interesting to draw, then I will draw my characters in said pose.