Step 1

Start a new document 400X 400
foreground color #603913 background color #321B04.
Filter --> Render --> Clouds.

Step 2

Filter --> Texture --> Grain setting: Intensity = 60 Contrast = 65
Grain Type = Speckle

Step 3

Filter --> Sharpen --> Unsharp Mask settings: Amount= 455 Radius= 5,4 Threshold = 27

Step 4

Now lets continue Filter --> Artistic --> Dry Brush settings: Brush Size=1 Brush Detail=3 Texture=2

Step 5

Now go to Filter --> Noise --> Add Noise settings Amount put between 13.61; check both Gaussian and monochromatic

Step 6

Go Filter --> Artistic --> Rough Pastels Settings here you can play around till you get the effect you like but here's what I used : Stroke length=12; Stroke Detail=9; Texture=Sandstone; Scalling=200; Relief=7; Light Direction=Bottom left.