Sorry in advance if it’s too light (About 4 hours)
The first two sketches are stable and I plan on skipping the detail when it comes to phase 3. It’s stable because the background surrounds the keychain and bracelet so the figure is clear. I The other two sketches are ambiguous because it’s supposed to make your eyes move from the gray areas back to the empty white areas.
The 4th image has a really strong Ambiguous figure/ground relationship. The negative and positive space in the image really balances out.