In Illustrator, you can blend in images to create a more realistic look. To do this, you need to use the blending modes. The three most common blending modes are Soft Light, Hard Light, and Overlay. Soft Light is the default mode. It blends images together so that they are soft and blended in. This is the best mode for creating realistic looking illustrations. Hard Light is a bit more aggressive and will make the images harder to see. It can be used for creating brighter or darker illustrations depending on what you want your image to look like. Overlay is a last resort and should only be used if there is no other way to blend the images together successfully. It will add an extra layer of transparency to your image and will make it difficult to see any individual pixels in your illustration.
