I've been back working on this colored pencil drawing of two mangoes nestled in tissue paper in a cardboard box. As you can see, I've finished up the second mango and have started in on the tissue paper. I'll save the bottom edge of the box and the black background below it for last - mainly so I don't have to worry about smudging the black into the tissue paper areas along the bottom.
I've included a close-up photo of the top right-hand corner so you can see the wax bloom that has started in the black area. "Wax bloom" occurs when a lot of pigment is burnished into an area. After a few days to a week or two, some of the wax will migrate to the top, giving dark areas a cloudy look. I'm not worrying about it now. Once I'm finished with the drawing, I'll carefully polish the black areas with a soft clean cloth which will remove the top coating of wax. Then I'll spray the entire drawing with a fixative. The fixative spray will keep the wax bloom from reoccurring.