Ask the 600D photographer for shooting skills.

Shooting skills regardless of camera model,

Problem 1, it's really difficult to take black-and-white photos directly with a camera. Generally, it is post-processing. It has little to do with contrast.

Question 2: There are many ways to achieve this effect. It is common to fill the theme with a flashlight at night and in the morning, and it is also possible to simulate the effect with a polarizer at night.