If you are working on a realistic mall, I suggest you add stores like Zara or H&M, as well as maybe some anchor stores such as a big department store. I'm from Spain, so maybe my suggestions are not really adequate for you. I also recommend you add some restaurants like Mc Donald's and some pizza places, preferably in a segregated area from the rest of the stores. If you see my profile, I was building a mall a few years ago, however I had a problem with that computer and sadly lost everything, but you can look at how I was making it, to maybe find some inspiration or learn from my mistakes. Good luck on your construction!!