IDK, lol just detaling and more stuff to get in the way i guess
Sorry to inform you, but that's not detailing, the same question Exofile asked you need to ask yourself when building a map, saying "it's just detail" doesn't cut it. Why is it there? How did get there? Does/Did it serve a purpose? Of course these questions need not be asked for something like a bottle on the ground but most certainly for objects like a tank.
Regardless, for a first map I appreciate that you put more effort into it than 90% of new map makers.