Would anybody be able to help me with my background?

Can anybody make the picture look more realistic? It’s supposed to be at night, but I’m not sure on how to do that.

They have a version of this at night but is making it realistic your goal or making it night??

Here is it darker but just saying I believe they already have one darker. Click it for better quality

Thank you! I’m so stupid, I realized they already have one, but thanks!!