When creating a new image via the New Image dialog, you can choose to create the image with an Art Media layer. To enhance the realism, additional options include:
Setting a canvas texture on which Art Media pigment will be applied.
Applying a fill color to the texture.
After creating the new image and applying Art Media tool strokes to the layer, the texture and/or the fill color can be changed. To do so:
Display the Layer Properties dialog by double-clicking the Art Media layer in the Layers palette, or by highlighting the layer and then choosing Layers > Properties.
Select the Canvas Texture tab.
Modify the texture and/or fill color setting.
Note: New textures applied after you've already applied Art Media tool strokes will not affect these pre-existing strokes, but instead just the strokes applied to the new canvas texture.