Jake Parker always nails it man, the dude is full of sage advice.
Good luck with all the cons, and good luck with getting all your art books done.
I recently put out an art book, it was full of art that I'd had sitting around for ages that I would always mess with but never call finished or post. I put out the art book and told myself that that was it, once the art book was out I'd never touch that art work again and that I'd only go forward and create new and better work. It actually really helped me mentally get over this hump I just couldn't seem to get passed.