Double Exposure: A blend of two photos together to make one. Black and White: An image without any color. Only has shades of black and white. Emphasis: A black and white photo that only has a portion of the photo in color to make that part pop out. Sepia: A photo that is only shades of brown and orange. Warmer then a black and white photo. Silhouette: A picture that is created (naturally) with a light source that makes the rest black and dark. Boat-in-Hand: A illusion picture that makes things seem bigger, smaller, or in a different location in comparison to another object or person. Rule of thirds: When a picture is divided by three lines (up or down) the focus of the image will land on the lines making that part more visionally appealing. It also defines the balance of the image because the image will not seem balanced if there is something on the line on the left and nothing on the line on the right.
Trompe is art that fools the eye and it was used in the creation of this scar. At first glance the scar looks real and bloody, this is just your eye fooling you. Fake blood was used to make the 'scar' look blooding and because less purple was used the scar looks fresh. That is only the effect of less purple! Black was used to add depth but in reality the scar is two dimensional. This is just a different type of art that is more scary.
The same tool that I used to make this duck skinnier (liquify) is used in modern ads of beauty and magazines. I think using photoshop to make something prettier is fine as long as it isn't what you are advertising specifically or it isn't said to be real. Let's say you are advertising clothes but you photoshop the face of the model that in my opinion is fine and maybe even good, but if you are advertising face makeup or plastic surgery then I believe that it isn't okay. I think they should also credit photoshop. Overall if anything photoshopped and released to make more beautiful follows these guild lines then I think it is okay.