Step #1
First start the tutorial by drawing rectangle.
Step #2
Draw outline for building.
Step #3
Make outline for half rectangle.
Step #4
Draw top right side of colosseum.
Step #5
Make outline for middle right side.
Step #6
Enhance right and left side of colosseum.
Step #7
Make outline for doors of right side.
Step #8
Draw doors of right side of colosseum.
Step #9
Make middle doors of the building.
Step #10
Draw long outlines on left lower side.
Step #11
Make doors on lower left side of colosseum.
Step #12
Draw edges of colosseum and enhance doors and building.
Step #13
Finally, make necessary improvements to finish.