Lately, there are a few techniques that have been used that should be added to your engine system.
HDR (High Dynamic Range Rendering, such as in Source, Reality Engine, Unreal Engine 3, and many more engines)
PRT (Precomputed Radiance Transfer, in Reality Engine)
Ragdoll Physics (Source, RealmForge GDK, and many more)
Ragdoll Animation (RealmForge GDK)