My opinion, is that to recreate (especially in Bryce, being a hobbiests app) the finest creation that man knows, can be a hard job. I dont think that anyone can truly do a render and then say, "well that looks like my palm plant in the lounge." its just not possible. Also, another factor which would contribute to (plausable) nature scenes being hard to recreate, is that Bryce has a very unrealistic "environmental atmosphere" if i can call it that, which makes it lack that crispness of say, 3ds max. But dont stress too much about it, coz i for one, have been working with Bryce for about 3 years now, and in my personal opinion, it takes a lot more skill to create a good interior scene, than a outdoors one.