A Rectangular Mirror Pattern (I forget which one) was rendered to create this Masked image.  Mask/Mandala Options parameters were set to use a Stencil image that was created from a photo of a thoughtful-looking little girl.  The Mask Background was set to a brownish Mask Color.  Normal photos can be loaded as Stencils, and a Strength value can be adjusted to control how the Stencil is blended with rendered effects.  Or, the Create Mask screen can be used to build Mask Stencils with more flexible options, and save them permanently as Stencil files.