I'm not really sure whether to be honest, or to move on to next topic without posting anything. Well, I'll guess I'll just post my honest opinion about it, hopefully, which will help you to improve your mapping skills.
When mapping, you first need to have an idea of what you want to make. What type of role should be played at that location, if it is some illegal hangout area, where can people take cover, where to hide, where to store their merchandise, their goods, equipment and many more. All that are just some of many factors you need to think about before starting to map any base. This mapping is just randomly throwing objects to fill in the area, without any sense, nor meaning. Well, outside is not that bad, it can actually be left as it is. However, when you enter inside, it's a complete mess.