Start contouring from the hairline. Oval shaped faces have a beautiful face form anyway so when you shade from the hairline, give it more colour. Use bronzer as well. Then shade under the cheekbones. Start at the end of the ear and go down softly. Make a triangle that disappears. Another place to contour is through the temple area. And what this will do is give you more cheekbones because you're adding shadow. It will also lift up your eyes. You can shade the bridge of your nose as well. When shading the nose, use a bigger brush.