Affinity comes complete with a range of preset brushes which you can customize to suit your needs. Alternatively, you can create a custom brush from scratch using your own image.
To modify a preset brush stroke:
On the Brushes panel:
Select a preset.
Click Edit Brush.
Adjust the settings in the Stroke section.
Do one of the following:
Click Duplicate to save the modified preset to a new custom preset.
Click Close to save the custom settings to the current preset.
Click Reset to return settings to those of the preset.
To create a custom preset brush stroke from scratch:
On the Brushes panel, click the panel preferences icon and then select:
New Solid Brush—creates a basic, solid vector stroke.
New Textured Intensity Brush—creates a brush stroke based on the opacity values of a raster image. In the pop-up dialog, navigate to and select a file, and click Open.
New Textured Image Brush—creates a brush stroke based on the color values of a raster image. In the pop-up dialog, navigate to and select a file, and click Open.
The new brush is added to the selected category using default settings.