The middle piece by Donna is from another lesson where we drew all white objects. The students had a set of 48 Prismacolor pencils in which to work and the 48 set contains only one or two grays so we mixed colors in order to achieve the values and color changes we needed.
The bottom piece is by Helen, our assignment was to work with colored pencil and odorless mineral spirits (solvent) on 5x7" Ampersand Pastelbord. I chose a simple still life of a few cherries on a colored surface so they could focus on the technique as well as the composition. Helen chose a fun frame for this piece also.