Expressive and communicative resources of drawing: line, value, texture, colour and composition
The CIUG Dibujo Artístico II paper reads a drawing before it is understood: first the overall tonal and chromatic organisation, then the quality of line and surface, then the composition's ability to hold the eye. This domain tests whether you control those variables deliberately rather than describing objects one by one, and whether you can name them in the written commentary with precise vocabulary.
Line
- Structural line builds axis and proportion; keep it light and revisable.
- Contour line describes edges: vary pressure so it thins at highlights and thickens where forms overlap or turn away from you (lost-and-found edges).
- Cross-contour lines wrap the form and prove volume with line alone, without any tone.
Value
- Build a seven-step scale, then reduce the subject to three values (a notan block-in) before modelling.
- Separate local value (the object's own tone) from illumination: the shadow side of a white object can be darker than the light side of a black one.
- Cluster tones instead of sprinkling them; reserve the darkest darks as accents that mark the focal point.
Texture and colour
- Visual texture suggests tactile surface through density, direction and scale of marks, not by drawing individual hairs.
- Work with hue, value and chroma at once; a limited palette (three colours plus white) forces relational colour thinking.
- Simultaneous contrast: a grey reads warm on blue and cool on orange. Use complementary vibration to animate neutrals instead of adding more pigment.
Composition
- Fix format and horizon first, then place the focal point off-centre using thirds or a dominant diagonal.
- Balance masses, not details; negative space is a designed shape, not what is left over.
- Control the eye path by contrast: maximum contrast at the focal point, decreasing toward the edges.
Worked example
Charcoal still life of a bottle, a cloth and an apple. Reasoning: (1) light structural line to check that the bottle axis is vertical and the ellipse sits correctly relative to eye level; (2) three-value notan block-in, giving the cast shadow more area than instinct suggests; (3) modulated line weight, heavy under the bottle base, almost absent on the rim highlight; (4) cloth described by directional zig-zag hatching, apple by smooth stumping; (5) final compressed-charcoal accent placed only where contrast must peak.
Traps
- Uniform outline weight, which flattens everything.
- Copying local colour as fact instead of relationship.
- Centring the subject, then filling the background as an afterthought.
- Overworking darks until shadows lose transparency.
- Using texture as decoration rather than as evidence of how a surface meets light.