Maybe not with an image like this, but for us the textures in the shadows, the grittiness of the line work contrasted with its precision and the powerful and simple composition is just too much. I'm drooling too. I'm just glad it's PS, because for a moment there I thought this was traditional media, which would have made me cry.
Me too, though I never like using someone else's brushes. So now I have to go and experiment on my own. I wonder if it isn't possible to get those delicious shadows just using a normal flat brush, but blending in a simple dusty texture afterwards. Maybe even over the entire drawing.