This is a simple way of color coordinating that works great for basic sweet coords. You always have to make sure that colors are balanced. One color for blouse, bag and socks and an other for shoes, dress and headbow. Think of the dress as the main color and the other colors are accents, we are now working with just one accent color to make it easy.
Above you see a breakdown of the blocks for this coord. See how the both the main color and the accent color are in all the three blocks, it makes it look balanced. Its also good that the accent color breaks of the main color. Try to get the colors one after the other. Pink headbow, white blouse, pink dress, white bag, more pink dress, white socks, pink shoes.
Here under you see some more examples with any colors than white as the accent also. I'm trying to make this as clear as possible so comment and ask if anything is unclear so that I can fix it. I will post more guides on how to do coords with multiple colors and much more.