I typically do not change anything if I do it may be a minor fix like where the model isn't very smooth, but something minor. But there are some things like one pic I did has a light snow in it with big flake, I added the snow with photoshop rather than insert a hundred or so tiny snowflake objects into bryce. Also the dusting of the snow on boots and stuff was easier to do with an air brush tool. Without it I would have had to make a new texture with the leather of the boots then snow on it, then line it all up and so on, but 3 or 4 quick blasts with airbrush tool and while color was perfect. However, I typically try to avoid post work mainly because I am extremely terrible at it. Heh, I came to realization a long time ago I couldn't draw a strait line if my life depended on it. Thats why I started with Photoshop 3.0 years ago. The line tool in Photoshop helps that tremendously. It lets me draw a straight line no matter how much caffeine I have had in a day. ;-) Anyway, I do not condemn anyone for using it, as I have seen some really amazing stuff done with it. I sometimes wish I was better with it. You can get effects like the powedered snow that at least I havent figured out how to reproduce in Bryce.