Nautilus and Ammonite: Passage of Time

The next finished artwork for the Nautilus and the Ammonite book project. This is the first image after the Nautilus has lost her dearest friend in the KT Event. It is meant to be paired with this stanza:

So the nautilus now in its shelly prow,
As over the deep it strays,
Still seems to seek, in bay and creek,
Its companion of other days.