A photographer without a mirror.

My friend can't see the specific aperture, speed and sensitivity from this photo. Just like cooking. You know there are sugar, vinegar, salt and maybe some mahjong in the cold noodles, but you don't know the proportion of each ingredient.

The exposure data is in the exif information of the original image. For this photo, if the photographer used the camera's automatic exposure function (automatic exposure mode such as av tv P), he must have used exposure compensation. Generally speaking, the exposure system of a camera tends to restore the picture to a medium gray tone. Backlight photography is a big challenge for the camera. Usually, when shooting this kind of high contrast scene, the camera often takes very dark photos (this is related to the working characteristics of ccd or cmos, and there is no detail when the highlight overflows, but it is possible to save it when it is underexposed), so as to keep more details in the high brightness area near the sun. So if the photographer uses automatic exposure, he needs to adjust the exposure compensation to increase the exposure and increase the dark details of the grass and horses. If the photographer uses M-range, that is, manual mode, there is no need to use exposure compensation, because manual mode skips the camera's judgment on exposure and directly controls exposure.

Iso, I believe, is the default sensitivity of this camera. Generally, there is no need to increase the sensitivity in the case of good light.

Aperture, this photo was taken with a wide-angle lens. The depth of field of the wide-angle lens itself is greater than that of the medium-focus and telephoto lenses. When an aperture of 5.6 or 8 is used, there is enough depth of field to make this hopeless image clear (if hyperfocal distance is used, you will get a greater depth of field than normal focusing). Of course, a smaller aperture can also get a larger depth of field, but if the aperture is too small, the diffraction will be more prominent and the imaging quality will be reduced.

I don't know anything about your master, so I won't comment.

You mentioned outdoor lights. By the way, when shooting a portrait on location, if outdoor light is used as the main light source of the portrait, such as shooting against the sea, then the shutter and aperture jointly determine the environmental exposure, and the aperture determines the main exposure.