Aha, I just started drawing mine. I spent about 5 years planning my book. Just planning it. I worked on things like script mostly, characters, mythology, language, culture, etc, etc. I also didn't start drawing until about, hm 2010-ish, so I hadn't been drawing long when I got the idea. Since then I think I've gotten lots better and I finally feel comfortable enough to start posting pages and putting it online.
NAOR
My script is nearly 100% complete. It's mainly incomplete due to fixing certain plot holes or trying to condense it into a reasonable length. It is a bit long. XD What I find though as I've gone through the first chapter and a half is that I don't stick 100% to my script I still vary a little from it due to being able to fit more or less on a page than I planned. I'm pretty excited though to be finally sharing it!
I like the art I'm seeing so far. I can't wait to see some pages!