Real World Bryce is down to $25? dang, everything is coming down..well, almost everything..;)
Scene composition can be as easy or as complicated as you like. Here's a whole list of bad habits I use to make scenes..;)

1. 1st thing is to decide where you want your center of attention to be..if you've messed up somewhere, sometimes you can get around it by drawing the viewer's attention somewhere else..;) 2) Sometimes you use a sense of balance..shapes or terrain equally on front, center, back, left, and right.
2. Scale. sometimes the way you place things next to other things (people next to terrains, for example) will make mountians look 5' tall, or turn regular folks into giants, etc.
3. All rules are meant to be broken. That's what separates good art from great art. Great artists steal..;)
4. See what you like. Monkey see, monkey do. If you see a Bryce pic you really like, try to figure out where things are placed, how they're textured, how they're lit (lighting itself can do as much for a picture as anything else,).
   I have no doubt that there are complete Composition classes at art colleges, so you can get as intense about it as you like. I use edges a lot (I actually take a sort of Stagecraft approach; if you don't see it, don't render it. You'd be surprised what the 'standard' view of some of these pics are like..;) That's why I put some things on the edge, to imply a sense of something there, even when it's not..hope this helps.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)