Orange peel has nothing to do with painting. It's caused from ABS being overheated when forming. When it occurs you can usually sand the worst off if it's minimal, but that's a bandaide fix for a piece that should be scrapped.
Now when painting, yes holding the can to far away can cause a grain like surface to appear. It's from the paint partially drying in the air before it hits the surface.
Other things that can cause paint to go bust is painting when the humidity is very high or low. The other thing is the timing of applying multiple coats, this varies greatly from paint to paint.