Looking for details in a picture can be a daunting task, especially when you are looking for the "major" details to put into your pattern. Blind contour drawing helped me to train my eye to focus in on the details. I continue to practice to increase my awareness for details. I always have to remember that contour drawing is to help me, not necessarily something I plan to share.
Here is a link that explains blind contour drawing: Blind Contour Drawing.
As you can see my contour drawing isn't something I would frame and hang on the wall of my living room.