Angles and Proportions
Draw lightly and loosely at first. Find the placement on the page of what you are drawing and lightly rough in the general shapes. As you draw, measure constantly, always comparing the size of one thing or part to another. The edge of your pencil can be helpful in seeing angles. Remember to keep your drawing light and loose until you have everything where you want it. Now erase all wrong or unnecessary lines. This is your foundation. Next, make your commitments to specific lines or lights and shadows. Refine and correct this continually until you can think of nothing else to do. Then your drawing is done and you are ready to begin another. The more you draw, the better you will become at drawing.
To gauge the incline of an object accurately, hold your pencil parallel to it. Then, without changing the pencil's angle, move it to the drawing and make a mark on your paper. The mark should be parallel to the angle of your pencil and thus to the object you are drawing.
Finding the correct proportions of an object can sometimes be achieved by drawing a simpler view of the object and transferring those proportions to the view you want. Here, a simple top view is converted to a more complex, three-quarter view.