The Nodding Portrait: Armature, Clay, and Drift
In the school studio, Rohan has six 90-minute sittings with a life model to produce a portrait head in the round. The model is a 17-year-old boy with thick, low-bunched hair and a slight turn to his left. Rohan's armature is a single 8 mm aluminium wire pushed into a 20 cm wooden base; the neck is a thin coil of the same wire. He added about 100 ml of water to 5 kg of clay to make it 'smoother'. By the third sitting the head leans forward when he presses the cheek, the chin has moved 8 mm down, and the ear positions no longer match. He measures once at the start of each sitting with a ruler, then works from memory. He keeps reworking the nose and has not blocked in the back of the skull. The model misses the fourth sitting. Rohan has four sittings left and wants a finished, exhibition-quality head.
1. Diagnose why the head is nodding and the landmarks are drifting. Give three changes Rohan should make before the next sitting.
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The nod is structural, not a modelling error. A single 8 mm aluminium wire cannot carry about 5 kg of clay; the neck coil is the weakest point, and the wooden base is probably not clamped. The wet clay adds to the problem: extra water makes the mass slump and the surface slick, so landmarks move under hand pressure. The drift in ears and chin is the symptom; the armature and clay consistency are the cause.
Changes before the next sitting:
- Replace the armature with a rigid central steel rod or a wooden post, add a cross-bar for the skull, and use a thicker neck section; clamp the base to a board or table.
- Wedge the clay to a firmer, consistent body and stop adding water; use only surface slip for joins.
- Support the head from below during work, or use a padded rest, so pressing the cheek does not move the whole mass.
- Re-establish the centre line and the ear-to-eye axis before adding any detail.
2. Design a measuring and blocking routine for the remaining sittings. Name fixed points and a sequence.
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Measuring routine: set up a plumb line behind the model and a fixed horizontal reference. Use calipers for width and depth, and a ruler for heights. Mark fixed points: inner eye corners, pupil centres, ear tragus, nose tip, chin, top of skull, and the sternal notch. Measure from two fixed points each time (triangulation), not just one. Record the numbers in a sketchbook so drift is visible.
Blocking sequence for each sitting:
- First 30 minutes: check the big masses - cranium, cheek planes, jaw, neck cylinder, hair mass. Keep the work broad.
- Next 30 minutes: place the features as simple wedges and planes; check the profile and the three-quarter view in a mirror.
- Last 30 minutes: refine one or two focal areas only; leave the rest as blocked masses.
Do not rework the nose first. The nose looks wrong because the cheek and brow planes are unresolved. Work from general to specific, and turn the stand regularly. With four sittings left, Rohan should spend at least two on structure and only the last on surface detail.
3. The model misses the fourth sitting. How should Rohan use that time without inventing the back of the skull? What should he say in the viva?
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The missed sitting is not permission to invent. Rohan has no evidence for the back of the skull, so he should keep it as a generalized mass and say so. He can use the time to: check the silhouette in a mirror; consolidate the front and side planes; prepare a fresh armature and clay for the next sitting; and make a measured drawing of the existing head. If another student with a similar head can sit for 20 minutes, he may use that as a proportional stand-in, but he must not present it as the model.
Viva answer: 'I prioritised the likeness from the front and the three-quarter view because those were the views I could measure. I kept the back of the skull blocked rather than inventing detail. If I had another sitting, I would measure the occipital projection and the ear-to-back distance.' That answer shows judgement about evidence. An examiner will penalise false finish more than an honest block. The same principle applies to the exhibition: a head that is strong from the front but weak at the back should be placed or lit so the viewer sees the resolved side, not hidden with misleading detail.