Select one of these tags to more tightly control breast sizes. Using the "edit tags" function, you can change this tag (and nothing else) to one if the others in this series, and the bust size should be the only thing to change. The more other tags are selected, the more this tag will have diminished effects.

This will make lighting and illumination more detailed. It'll make realistically detailed shadows, taking into account light reflection and subsurface scattering (Light going through clothes, hair strands, leaves, etc.). Overall, it'll improve lighting quality and make lightsources (candles, lightbulbs, fire, magic, etc.) give actual light.