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Originally Posted by Ngaire Winwood
I am not so sure about how you measured it though with the two lines bit.
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And I'm not quite sure, either, where I lost you.
If you're referring to the two vertical lines I "drew" in the image, above, showing your drawing of the nose, those are really just to show the relationship between the two points mentioned, at the top of the nose and bottom contour of the fleshy wing of the nose. There are two lines in your drawing, to indicate the misjudged "horizontal distance" between those two points. In Ryder's version, there is no "horizontal distance," as the two points are more or less directly above and below each other, respectively.
Another "angle" -- Two lines on the form might be, for example, the back and front edges of the neck. If you hold up your pencil and sight along the back edge, say, the pencil will have a slope toward your left as it rises. If you carefully move that pencil over to the front edge, you'll find out if the slopes of the two edges "match" (that is, that they're parallel) or if they diverge, and if so, whether they're getting closer to each other toward the upper part of the drawing or the lower part. That same relationship should be preserved in your drawing.
Lastly -- If you're looking at only one "line" in the drawing -- say, the slope of the back contour of the hair, then compare it with a vertical (or if appropriate, a horizontal) line in an imaginary grid placed over both the resource drawing and your own drawing surface. (If you have trouble accurately "imagining" a vertical, just hold the tip of the pencil at arm's length and let gravity impose a vertical orientation. Or tie a small weight to a length of thread and hold that "plumb line" out in front of you, comparing the vertical thread to the angles of whatever edges you're working on in the drawing.)
Perhaps I touched there on whatever it was that was confusing you, or perhaps I've just been "blendy and fiddly." If something's still not clear, let me know. Text is a difficult way to try to teach visual techniques.