Well, actually idk how to start, but those things below can be pretty useful for "beginers" in "accurate" fnaf modelling.
But tbh I don't recommend to start your modelling career with fnaf, but anyways, let's begin.
1. Use more references. And how to set up the cameras:
If you actually want to make an accurate looking model, you have to use more than 7 references. And you also have to set'em up at once, not one after another.
For example the most useful refs for Classic Fred:
a. At first let's talk about orthographic and perspective views. Imho Scott neve