In terms of focus and depth of field, the photos turned out to be not the best, but at least part of the body in the first photo and the eyes in the second I managed to get sharp enough to be interesting to watch at.
I often see amazing quality underwater photos of this kind, taken at night, when only the main object is lit, and there is darkness of the water around, and I dream of doing these too, but I need more, much more practice :)
Thank you for reading - I'm glad this story turned out to be interesting, because I was unexpectedly and curious to find out that this is not a cuttlefish.