Understanding how light wraps around these forms helps you to paint them with ease instead of struggle.

This week’s exercise, drawn from Wednesday’s tree study demo, focuses on seeing and rendering the cylinder beneath the surface texture.Key Idea

• Every cylinder has a light side, a shadow side, and a soft turning zone between the two.
• The axis of the cylinder (its invisible center line) helps you judge how the form tilts in space.
• When you grasp this, bark, fabric, or skin become surface variations—not the main event.

Assignment Steps

• Choose a single subject with a clear cylindrical form—tree trunk, arm, bottle, or rolled cloth.
• Start with a quick brush mark to locate the axis and direction of light.
• Block in large value masses first: one for light, one for shadow, with a mid-tone bridge between them.
• Model the form by adjusting the rate of change between light and dark—slow turns feel rounder, quick turns feel smaller.
• Reserve your lightest accent for where the form faces most directly toward the light.

Tips

• Keep the light-to-shadow transition soft—avoid hard edges unless the cylinder is sharply lit.
• Use reflected light sparingly; it should never outshine the main light.
• Notice how color temperature shifts: warmer in light, cooler in shadow.
• Compare opposite sides—does the cylinder roll toward or away from you? Adjust value shifts accordingly.
• Think in families of tone rather than outlines; the cylinder is a continuous flow, not a stack of parts.

• Simplify.
  Choose an open, uncluttered motif. Limit yourself to a few large shapes and a clear light–shadow pattern.
• Understate color first.
  Mix a slightly muted version of each area. Lay these in thinly before committing too soon. Pile up the lights later.
• Push the contrast.
  Observe the direction and temperature of light. Match what you see, then give it a little nudge.
• Adjust near-equal tones wet-into-wet.
  If two areas read close in tone, block them in identically first, then shift one slightly.
• Hold back a little.
  Save high-chroma notes and crisp edges for the final accents so the overall read stays unified.
• Look for subtlety.
  The small shifts have great power–they’re felt more than seen

When it’s time to finish off a work, focus on a few key areas and leave the rest alone.

Some of the paint may be too built up to layer fine detail and subtle touches of color. That’s fine; the heavy paint gave your work its strength. Now it’s time for some polish.

This is where sanding works beautifully. Try this on any work you feel is successful and almost finished, but not quite.

• Use 220-grit sandpaper, moistened—not soaked—with Gamsol.
• Gently rub the sandpaper over the parts to be reworked.
• Wipe the area just sanded with a cloth moistened with Gamsol. This removes a bit of paint—no need to worry.
• Rework the sanded parts with thin glazes (to enrich color and add detail) and scumbles (to unify tones and soften focus).
• If any of the lights get lost, use the tip of a palette knife with a touch of opaque paint to restate highlights and bring back clarity.

Finishing isn’t about doing more—it’s about doing less, more precisely.

From the Video Demo

• Notice how you test the sandpaper’s pressure first—barely touching the surface. The point is to skim the texture, not cut into it.
• After sanding, you immediately wipe the residue with a Gamsol cloth. Think of this as clearing a window; it reveals the tone beneath without destroying it.
• When you glaze over the sanded area, keep your strokes long and confident. Let the thin paint flow—don’t try to “fix.” You’re reviving color, not repainting.
• The scumble pass softens everything into atmosphere. Let your hand stay loose here; drag the brush as if moving air, not paint.
• Finally, a touch with the palette knife reclaims the light. Use it sparingly—one bright edge is often enough to wake the painting back up.