Step 1: Materials and Tools
MDF or Foam-board
Plaster of Paris (optional)
Craft Knife set
Step 2: Building
If your building is a ruin, break off some of the styrene for a damaged look.
If you going for an undamaged structure make the edges and cuts clean and straight.
Look at reference images of real / fictional buildings and begin to slice of pieces of styrene to add more details to the structure
Make sure your craft knife / Scalpel is sharp to make cutting easier and to prevent the little balls of styrene from breaking apart while cutting.
Once you are happy with your pieces, glue them to the MDF base / Foam board base.
Step 3: Painting
After the black paint is dried.Use a dark grey paint and dry brush it onto the building until the building is mostly grey,with the cracks and grooves showing black.
Dry brushing- touch a small amount of paint on the brush and wipe off the excess on another surface until the brush is nearly dry,now brush this small amount of paint left on the building.
Allow the grey coat to dry.
Now dry brush a small amount of light grey onto the corners or edges,this is to make the highlights pop up the stone edges,giving a more 3D look.
Allow to dry Again.
Above are image examples of the 3 stages of painting. Base Coat, Dry Brushing and High Lights.