Who is this lady and what is the gift given to her?

Is she a Negro (dark brown skin)? Why the monster has fish tail and bird’s wings?

Is there a real story or just a fairy-tale behind this scene that I spotted on an old building on main square in Poznań?

I couldn’t find the answers in internet though I searched pretty long …

Polish for “monster” is “potwór“. In Polish we have two types of “u”: open “u” and closed “ó”. Simple, isn’t it?