What is that creepy half human, half fish creature in the tank? Not even sure what to tag it. animal? and then the scale/perspective of the image - is that girl a giant or are the men to the right Lilliputians?
Think the creature in the tank supposed to be a mermaid, or more a sirene. And well thats normaly how they look ^^
The tank covers alot of the stuff behind it, so it makes the perspective look a lot weirder than it should.
She is indeed a siren. We don't have a siren tag though, so I'd say go with mermaid.