Now that we covered Contour Drawing, we can move on to our next topic, Cross Contour. Practicing cross contour will synthesize what we discussed in contour, while adding a new thing to think about, which is direction of line.
Cross contours depict the turn of the form, or the way that the form sits in space.

The first step to making a cross contour drawing is of course first to start with an outer contour of the form. As you did with regular contour drawing, vary your line pressure/line weight. Once you have your contour done, you want to look at the object to figure out the correct direction to go in:

The lines should mimic the shape, so look for the direction of the curve at each side of your object. Also there are several ways to make your cross contour look more three dimensional:
1.) darken the lines more towards edges and sides, have them slowly fade to a lighter line in the middle.
2.) have more lines where the form recedes, so again, towards the edges/bottom of the form. In the middle where the form is the broadest there should be more space between the lines.

So, line variation and line spacing. Notice the difference between the one on the right and the one on the left. (The one on the right is what not to do!)...
The difference between the two is that the one on the right, which really just looks like a flat, gridded form, lacks line variation and changes in line spacing.

Here are some more examples of cross contour:

 This is half-completed, but you can again see the line variation between dark and light lines, (dark lines at edges, corners, sides), and some changes in spacing. Also, precision is very important, so be sure to go exactly to the edge of the outer contour.

To practice this, chose two objects to draw with cross contour (rounded objects work well, as do things like gourds, bell peppers, etc). Draw them and post pictures. You will draw a total of four cross contour objects, but we'll do them in sets of two so you can get feedback from the first ones you do. You should also look at the youtube video for Cross contour before you start drawing!