Explore Line Width with One Brush

A single brush can make more than one kind of mark. This exercise explores which widths you can place and repeat comfortably before adding a stem, stripe or decorative line to a pre-outlined canvas. Keep the brush and color the same so your attention stays on handling.

The National Gallery of Art's lesson on line describes lines made with brushes and drawing tools, including thick, thin and curved forms. Here, you will make a small sampler to choose a line for your own painting.

Prepare a separate practice area

Gather one brush, one paint color, a palette, a separate surface suitable for that paint, table protection and a pencil for notes. Set out the cleaning supplies required by the paint and brush labels. Choose a comfortable working position and leave room to move your hand without crossing wet marks.

Identify a possible use on your canvas, but leave the canvas untouched during the test. A broad leaf stem is a useful example. If your brush cannot comfortably fit the intended area, use the brush-selection guide before continuing.

Make three short rows

1. Repeat one width. Place a small working amount of paint on the palette, following its directions. Make three short, separate strokes using the same comfortable grip and direction. Leave each stroke as it lands so you can compare it.
2. Explore a broader mark. In a new row, try a small change in brush contact, such as a slightly different angle or gentle pressure. Change only one thing. Observe whether the mark becomes broader; do not force the bristles to spread or keep pressing when the brush resists.
3. Change width within a stroke. Start with the contact that gave you a narrower mark. Try the broader contact in the middle, then ease back as you finish. Repeat only if the movement feels manageable. Different brush shapes will respond differently.

Pause to replenish paint or clean the brush as its instructions require. Label that interruption: a change in paint load can otherwise be mistaken for a change caused by your hand. There is no need to add water or another medium to complete this comparison.

Choose a repeatable mark

Circle one stroke you would like to use and try it twice more in a clear area. Compare its beginning, middle and end. Can you start where intended, keep the width within the available space and stop without a large unwanted mark?

For example, use a steady-width mark for a stem if the changing-width version crowds the leaf boundary. Consult outline readability before applying it. Keep the sampler beside the canvas as a reminder.

Common questions

Must the strokes look identical?

No. Look for a result you can use comfortably; small differences can remain part of the painting.

What if this brush makes only one useful width?

Keep that width for a suitable area. The test has identified a practical limit. Choose another task from the painting practice guide instead of forcing the tool.