I'm just finishing up the book for Color Drawing Form, and it's full of nice finished delineations. For each page, I took some time to clean up the errors that I had made in the old versions. I especially focused on the plan and elevation obliques, to clear up some problems like layering and line weight.
I redid the environmental designs, adding some more text to make it balanced, and changing some of the line weights. I almost paid more attention to the layers, making sure that the letters were behind things on the building like pipes and windows.