Here is an early attempt at a contour drawing of my chair:

After this drawing I did another, adding some of the interior lines:

You'll be amazed at how quickly your powers of observation increase when to take a few minutes once in a while to do a contour drawing. Here is another chair I did adding a bit of cross-hatch shading:

To make it a little more juicy, try doing a contour drawing with a big, wet watercolor brush. This makes you see the contours more generally, less in detail. After the watercolor dries, try a contour drawing of the same object in pen on top of the watercolor. Here is my spray bottle:
And a jar of brushes:
In the above two examples I tried to keep the pen drawing and the watercolor drawing together, so I fudged a little on the spray bottle nozzle while drawing in pen. In this self-portrait, I did the contour in watercolor, then the drawing in pen over it without trying to coordinate it.
Try both. See where it takes you!