Duplicate Black and White layer. Go to Image - Adjustments - Gradient Map.
After gradient map the result will be something like this:
Now go to Blending Mode of this layer and se Luminosity 100%.
The result begins to look like a stone drawing.
Step 6 - Transform into Sketch
Duplicate Black and White layer again and place it on top of Gradient Map layer.
Set the foreground color black and background color white.
Now lets transform this image into sketch. Go to Filter - Sketch - Photocopy
Set detail 2 and darkness 13 .
Now with Magic Wand Tool , tolerance 5, select an white area and press delete.
Go to Blending Options of this layer and check Bevel and Emboss.
Change the Blending Mode of this layer to Hue 100%.
The result should look like this:
Step 7 - Draw a Saint Aura
With Ellipse Tool draw a circle. Go to Blending Options and check Stroke, size 3, color black.
Duplicate this layer, than select and merge the 2 circle layers. Select the white area with Magic Wand Tool and delete it.