As Roy stated, it is best to match your model's features to photos of actual vehicles, although finding adequate references isn't always an easy task, which is why collecting books on your subjects becomes as much of a hobby as building the models themselves.
Tiger #724, a former 1st Co / sPzAbt. 501 machine, later re-assigned to the 7th Co / PzReg 7 / 10th PzDiv., is the only Tiger of the N African theater (I'm assuming this is your intended arena) I've seen sporting "kill rings", (6 of them). It was not as common practice as folks would think.
Here is a great site with lots of info and photos, this page in particular on sPzAbt 501 vehicles in Tunisia;
http://www.tiif.de/thread.php?threadid=54&sid=39a1b570f7666c77b2ef51eda422e62c