This spaced out, small sans serif font in capital letters works well on top of colour and image.

A poster a day http://www.magdiellopez.com/c05d1yf1qz4hy2714yyi9u2m4p0tpz #GraphicDesign #Inspiration

This achieved emphasis by creating a focal point using contrast. By making the background so colorful the model in black and white stands out but is still unified by pulling the color into the sunglasses.