Drawing Fundamentals: Line, Form, Proportion, Perspective and Composition
This domain tests whether you build a drawing on an armature of geometry rather than copying outlines. Expect questions on sight-measuring, one- and two-point perspective, horizon-line logic and compositional arrangement.
Line and form
Every drawn edge is either a contour (the outer limit of a form) or a cross-contour (a line describing surface as it turns). Reduce complex objects to primitives - box, cylinder, sphere, cone - then cut and add. The ellipse cap of a cylinder has a minor axis that always points back to the vanishing point or eye level.
Proportion
Proportion is ratio, not size. Fix one constant unit - say the object's width - and compare every other measurement to it. Sighting down a pencil at arm's length with a locked elbow gives reliable ratios.
Perspective rules
The horizon line is eye level, and it moves when you do, so fix it first. In one-point perspective all receding orthogonals meet a single vanishing point on the horizon; in two-point, two VPs sit on it. VPs placed too close to the object cause violent distortion, so set them well outside the picture. Verticals stay vertical in two-point only while the picture plane is vertical. Anything above the horizon shows its underside; below, its top.
Composition
Keep the visual centre off the geometric centre, use the rule of thirds, overlap forms, vary sizes and avoid tangencies where two edges merely touch or a line grazes a corner.
Worked example
A cube seen corner-on: fix the horizon, mark two VPs roughly three frame-widths apart, drop the nearest vertical, then run rail lines to each VP. Check with a pencil sight that the near vertical is longer than the far one and that the side planes taper.
Traps
Treating the bottom of the page as the horizon; drawing pointed ellipses; making far edges parallel instead of convergent; drawing the object you know rather than the one in front of you.