Fill Flash Outside is typically used to spice things up by ironing out unwanted shadows. Shadows like dark circle under the eyes or under the nose etc. To take these types of photos remember to keep it subtle. Keep things natural, you shouldn’t want your photos to look fake or unrealistic. You should always have your subject in an angling position with the sun. This is so the sun is behind the back of the subject, with this placement the sun reflects more light on the hair and also catchlight on the eyes. You could also use a reflector, to specifically ramp up the glow of the subjects face. The reflector bounces the flash.