Some settings could have a better name, some are to verbose:
bg_image_is_set -> bg_is_used or bg_in_use
background_image -> background
left_margin -> left
right_margin -> right
top_margin -> top
bottom_margin -> bottom
Note that the purpose of the settings should continue to be clear to the user since they are under a section like [margins], but maybe the code could be less readable. But still, the code has documentation.
Some settings could have a better name, some are to verbose:
bg_image_is_set -> bg_is_used or bg_in_use background_image -> background
left_margin -> left right_margin -> right top_margin -> top bottom_margin -> bottom
Note that the purpose of the settings should continue to be clear to the user since they are under a section like [margins], but maybe the code could be less readable. But still, the code has documentation.