Selfishness is shown in Snow White entirely through the wicked step mother. She does everything she can to get rid of Snow White, just because she is not a beautiful as her, and wants to be the most beautiful in the kingdom. If she can't take her beauty, she has to kill snow white.
Selflessness is shown through Snow White, because no matter the situation, she does what is right, and doesn't think twice about it, she thinks for others not for herself. She cleans the dwarves cabin, she takes care of them, she shows kindness to the animals, and she even shows kindness to the old lady who shows up to her door, even though she poisons her.