I'm not exactly sure that Danny is referring to depth of field. Her initial post talks about the camera providing good fill but the "lack of depth" using certain settings. I believe she is referring to lighting rather than DOF. Danny, front lighting such as that given off from an on-camera flash does give the effect of flattening textures and details such as the contours of the face. In the photograph you posted the sun is at camera right, thus providing sidelighting. Sidelighting rakes across surface textures and provides dimension, thus you were able to notice the shape of the cheekbones. If you are talking about depth of field, the distance between the farthest object and the closest object in a scene that has acceptable focus, then I would agree with zx7dave's first post. If you are referring to dimension in a scene due to lighting conditions and the ability to control highlight and shadow detail, then try balancing the indoor flash light with additional window light to add dimension to the images. Or when shooting outdoors and using fill-flash, try using a large piece of foamcore to bounce light back onto the subject.