Thanks Francissimo. Yep, just PS.
With Bourmout I started with a pencil drawing, where I had drawn the shadows first in pencil.
With Sagemound I did it all in PS. Well, I had a quick outline sketch from pencil but all the detail and shadows were conceived and drawn in PS.

I did start on the perspective part, for those who had asked about that.
I am working on the color right now. I'm trying to get an update for tonight or tomorrow.
I'm still trying to decide how I want the final layout to look though.