you are doing the overkill.. you don't need fine art.. normal AA would do.. as well as normal everything. Agressive is killing it all. Try using fine art if only if you have materials that need that extra smooth effect.. like once..i used a grainy mat for a wall.. using normal AA gave it a dull grey effect..completely not what it ught to be. Using fine art rendered it smooth.

You'll notice too.. your render timings change.. if you use glass or water, i'd advice you never to use fine art unless you want to go on a holiday and come back and still see it rendering.

Also.. using Fine art requires that you sort of know how many rays of pixels you want it to get into and the rest of the jing bang options that come with it.. .. since you new to bryce.. render normal..and go thru a tut on render options..

As for aggresive.. go normal.. don't push. It depends on how many objects are in your scene. If it's a few.. then normal. If it is a hundred..then go for agressive. '

Cheers and happy brycing