Contrast is is the visual ratio of different tones in an image. The first photo, I thought these roses looks pretty and surprised they weren't welting. The main point is the big rose but also the roses in the back make it pop out. The second photo the main focus is this fly i have in my backyard. I don't really know but it was being balanced out from the color of the brick to the color of the brown. The third photo is being balanced by the green background making everything pop out. The third photo is this flower my mom was trying to grow inside. I brought it outside and you could see the orange as the main focus but other colors that help it blend. The last photo I don't really know how to explain because there's more than one color as a focus but the background makes it stand out.