LEGO Imperial Stormtrooper 2014

Stormtroopers have been featured a wide variety of sets in the Star Wars Theme, and have been redesigned with more detail or fixed details often.
Although the standard Stormtrooper looks almost the same in every set they have been released in, over the years, they have been slightly redesigned multiple times. The helmet has also been redesigned five times.
One of those variations appeared in the 7264 Imperial Inspection set, where they had more detailed shin plates. The set featured 4 troopers with previously unused leg detail, having increased detail of the utility belt and knee plates over the usual blank legs.
There are currently five variations of the LEGO Stormtrooper helmets: One with two mouth grills split into halves, the second with a single black mouth grill, and the third with a thick, gray mouth grill with small black lines, the fourth with a thick gray mouth grill separated by small black lines and with a black outline around it and the fifth and latest one, which features exaggerated mouth printing to more closely resemble the Stormtroopers in Star Wars: Rebels. The eyes have also been enlarged gradually throughout the years.