Portrait photography is when you take a picture of someones face or have them take a picture of your face. Portrait photography is kind of like profile picture because there bth a picture of your face or someone else. its just that a profile picture is the side of your face. It kinda relates to a silhouette too because a silhouette is an image of a person or an object and is filled with one solid color which is usually black. So to make a silhouette you need to start by taking a portrait first.
To make a double exposure in photoshop you need to go file>Scripts>Load Files into Stack, after you can resize your pictures, then you use the dodge tool to make your background white or you can add some textures. Next you crop your images 8 inches by 11 inches . When you have all of your pictures resized and cropped you can place the pictures where you want them to be. Next your going to turn on your blend modes. You click on the layer>Blend Mode> Screen (you can choose any blend mode , it doesn't have to be screen mode). Once your done with that you might have edges and your going to want to make it look like the images blend together, your going to take your eraser tool and give it a soft opacity to make it look like the images blend together.
In my exposed portrait, my symbols were a sunset and a picture of underwater. I chose the picture of a sunset because I enjoy watching sunsets and taking pictures of them, and I chose a picture of an underwater scene because I like using my Gopro at the beach, also I love the water its beautiful and like totally awesome. I think I could've used one picture that was an item or like an animal or something because in my final it looks like I have a pink body, and a blue head with a little bit of texture to it. To me it's pretty bad, I had a third image but we were only allowed to use two so I was stuck with a pink body and a blue head. My third symbol was going to be a wave crashing and it was taken horizontally so it was a strip of wave between the sunrise and my underwater symbols. Then I realized I was only allowed to have two symbols so I just have a blue head and a pink body with some trees by my neck.