For this assessment, I had students do a still-life drawing from a white still life. At the beginning of the year, I gave them two days. Everyone finished well within that time frame. At the end of the year, they received 3-4 days. Even the early finishers needed at least 2 1/2 days to do theirs, so this made me happy that they weren't rushing!
For the final assessment, students could shade their still life with pencil or they could paint it with acrylic, depending on which they preferred. All year long we did a variety of projects to reinforce using value, such as the value cities, pastel poinsettias, the fall drawings with leaf prints, and the still life practice just before our post-assessment. We also did a lot of drawing from real life this year to reinforce observational skills.