Street club night

i would like to know how do you come up details, when i try to draw something it feels like its only walls and few sign and doesnt feel like a real thing, while yours looks like you took picture and drawn over it soo much detail also people say use reference but i never find right reference for right scene with right object to go with my scene

also how much time do you take to make a scene like this

update: I saw your stream you actually trace over your blender render but again my question how do you come up with detail to fill your blender scene i also use blender and before coming into 2d drawing i suffer from same problem in blender and still am suffering