Whether it's writing a book... creating anything really... you have so many ups and downs. You doubt, you believe, you fear, you give up, you come back to it, you trash it, you find your groove and you're done. Well, probably not, but you're at a point where you know it's all done but the real work of editing, sending it out, etc.
I pulled this image because it's a reminder I'm not alone. The person who made this felt alone but knew that others would recognize the struggle. It's universal.
My change would come at the end there... where it says 'Wait, now what?' the line should descend much lower. That is the bottomless feeling. Next time -- this time -- I'll do it right.