The inital sketch, blocked in with PS. I usually play around with the composition at this stage and explore a bit for precisely where I want to crop.

 

 

 

 

 

 

 

More refined after progressing with the blockin with the hard round brush in PS, using the marker in Painter, and checking my reference.

 

 

 

 

 

 

 

 

Finalized main building architecture with Sketchup, generally did another detail pass in PS and Painter with the round camelhair, blender, and the hard round brush.