Hovering lady face above dolphin: fine art in Nuremberg

I saw this interesting piece at a Syrian restaurant in Nuremberg.

I am always curious: what prompts a painter to include a disembodied head? Is this some sort of metaphor? If so, what for??

I am also curious: why is the dolphin giant?

It all reminds me of the painting I saw at the Schatzkiste. There was another disembodied head and an animal (a cat) with skewed proportions. Maybe it was the same artist.