I am learning iOS development and I have some questions to ask you in my first post.
To learn iOS I do an stupid application which have Settings.bundle. I want to put small images or icons inside it but I can’t.
I also write to the right of the PSChildPaneSpecifier the value of a PSToggleSwitchSpecifier
Apple does it, see the image:

I search in NSUserDefaults Class Reference but I didn’t find anything about this. Maybe it is impossible and only Apple can do.
You’re right, it’s something only Apple can do. Third-party apps are limited in what they can achieve in the settings bundle. The only icon you can have is the app icon on the first page, and the only information on the right hand side will be string values – see here for details.