To have into account:
Section: Not everything is suitable for embossing, too small areas will result in a blurry section making the message unclear or giving, as a result, a no clear effect, which means a waste of budget.
Material: it’s advisable, but not mandatory, to use thick/heavy materials to get a better embossing effect.
Additions: Over the embossed area is possible to add other treatments, foil stamping is one of the most common process added to the embossing, the wide range of possibilities of embossing allows you to play with texture, color, and design; being even possible to add multi-level embossing.