1. Normal Map Generation

a. Click "Add Normal Generator" button.

b. Select a single Mesh Object.

c. Click "Start Splatting" button.

d. Adjust settings to achieve the desired look.

e. Select output directory.

f. Click "Render Textures" button.

2. Shader

a. Load up painterly normal map and random brush stroke textures for use in your shader.

b. Connect normal map texture to Normal Map node.

c. Use brush stroke map (RGB Channels) as noise to drive other parameters.

d. Adjust settings to achieve the desired look.   

3. Brush Stroke Scattering

a. Select an object and click "Add Modifier" button.

b. Adjust settings to achieve the desired look. 

4. Compositing

a. Click "Add Compositor Nodes" button.

b Adjust settings to achieve the desired look.