Now you can begin layering color into the rose drawing, starting with a foundation that will allow you to blend light and dark tones later. I've selected PC924 Crimson Red as the base color for this rose. It's a rich, slightly cool red. Many areas that I've shaded here are going to be darker, but I begin by laying down a fairly even, light layer of color first. This will stop the paper fibers from grabbing the pigment and making it hard to blend. I've also shaded some Prismacolor Colorless Blender PC1077 over the areas that are going to be very light, for the same reason.
The scan has emphasized the directional marks in my shading. I'm aiming for a fairly smooth surface, so I'll try to use more even marks, using a more circular motion with the pencil. If you are using strong directional shading, think about the contours of the shape you are shading and use the direction of the marks to suggest this, as you layer the color.