1. Vertical / Horizontal (X/Y Axis) Distance (Proportional)
3 Types of Measuring:
Angle
Vertical / Horizontal (X/Y Axis)
Distance (Proportional)

2. Properties of Your Pencils
B Pencils : Dark and Soft
H Pencils : Light and Hard

3. Outline vs. Contour line

4. picture plane

5. Assisted Perception on angles of receding edges
The Clock Angle Tool
Assisted Perception on angles of receding edges

6. Angle Transfer

8. Angle Transfer

13. Vertical
Measuring
Angle Measuring

14. Veritcal / Horizontal Measuring
Assisted Perception on X/Y axis

15. Distance / Proportional Measuring

17. Distance (Proportional) Measuring
1 head length
2 head lengths
3 head lengths

18. Linear Structure Drawing

19. Gesture Underdrawing
The primary purpose of a gesture drawing is to quickly search for information about the approximate placement, size and relative proportion of where things are located on the picture plane.