Nice color selection. I think you could enhance the sphere’s form more by adding more dark and mid-tone toning on the right side and bottom. The reflected light could be toned down a little by adding some color. It should not be as white as the main highlight. It often also appears closer to the edge of the subject. Since you trying to recreate a glow of light bouncing off the surface the sphere is sitting on, the reflected light is not a controlled arc. Using an very pencil to blend the colors and then adding blue on top of the ivory helps to achieve that glow effect. You are doing a wonderful job!
Nice color selection. I think you could enhance the sphere’s form more by adding more dark and mid-tone toning on the right side and bottom. The reflected light could be toned down a little by adding some color. It should not be as white as the main highlight. It often also appears closer to the edge of the subject. Since you trying to recreate a glow of light bouncing off the surface the sphere is sitting on, the reflected light is not a controlled arc. Using an very pencil to blend the colors and then adding blue on top of the ivory helps to achieve that glow effect. You are doing a wonderful job!