Awesome skins but how do I unlock them.

I love....the skins and the little mini one is so cute but how do i get all the others. There are a bunch I want but I ether have to buy them or drool over them for the rest of my life. But still I will rate three star because they are professional made.

BoydskiDude about Aphmau Girl & Boy Skins for Minecraft PE & PC ( Pocket Edition ) - Free Skin for MCPE, v1.0