1. First draw the bulldozer blade.
2. Then draw the mechanical arm of the bulldozer connected to the shovel.
3. Then draw the outline of the bulldozers body.
4. Next draw the windows of the bulldozer.
5. Then draw the bulldozers lights and exhaust pipe.
6. Finally complete the lower part of the body and draw the wheels of the bulldozer.
7. Apply a nice color and you're done.