I never thought i'd read that one day... On your picture, there's one wonderful helmet, the RS one, and one, let's be honest, ugly helmet, the efx.
As you're new you're perhaps not familiar with how original helmets looks. Here's an original HERO helmet on the picture below, and you can see that there's a world between it and the efx one. The whole general shape on the efx is just wrong compared to it.
Regarding the ear screws, they are required for second the level of approval. But yes, for basic 501st approval they aren't required.