Your Prima body includes multiple bust and nipple variations, and if you have purchased Elite then you will also have a switch to enable or disable the Petite bust. Each bust/nipple variation gives you some subtle shaping changes to your bust while still fitting within the shapes that creators design for. We suggest you look at your bust from an off-angle view to see what the shape changes are as you try them out!
The first nipple shape is designed to flatten your nipple which can be useful for BOM clothing.
An optional HD Nipple layer exists that you can enable/disable using the switch and will give you a high definition nipple overlay that will cover your normal skin nipples. The HD Nipple layer is an alpha layer which may interact poorly with hair or other alpha clothing items (a standard SecondLife issue).
We provide HD nipple textures in 12 tones and two sizes (small on top, large on bottom). Once you have selected a particular tone and size you can optionally tint (among other things) your HD Nipple using the Appearance section of the HUD. You can optionally use the "Erase" button to erase the HD Nipple layer to blank white if you wish.
With the advent of the 1.2 release of Prima Elite there are now two new bust shapes (one for busty, one for petite) that you can use by choosing bust shape number four. These shapes are the same as the "Busty Bubbly bust" addon and the "Petite Fitness bust" addon.