Here is a picture showing the back with both corrections done in it. One of them fans OUT and one of them fans IN. What a back I have!!! Check out those grainlines!
What I do for the dart issue on the right is I draw the whole dart BEFORE I distort it -- I cut it out -- and then I have a move-aroundable dart I can just trace onto my paper pattern.
Then, I had to find some "muslin". I didn't really have any muslin but I found this nice piece of cotton that I probably bought on sale years ago at a quilt shop.