Ideas seldom arrive in their complete fullness when I start out a drawing of this sort. Mostly I have no idea what I will create. As one works, the ideas flow, a break for tea, then a return for a fresh look and more to add.
So the order of creation ran something like this: Octopus > Kelp > Fish (strangled) > 3 snooty fish > more fish > naval mines > more fish > eel > coral reef. …with lots of fix ups in-between.