Draw a large rectangle for the main building
Add a triangular roof on top
Draw a centered front door
Add windows evenly across the front
Extend side sections to make the mansion wider
Add a second floor with more windows
Draw columns or pillars at the entrance
Add a staircase leading to the door
Sketch smaller roof sections or dormers
Add chimneys on the roof
Draw balconies or terraces if desired
Outline the mansion with clean lines
Erase extra guide lines
Add details like shutters, railings, and trim
Shade or color the mansion