I will say this for the Siren trailer: the mermaid in it looks properly alarming.
There’s nothing really… bad… about her features (my wife notes that the pupils are very, very contracted), but I’m not really surprised to find out later that she’s got the ability to transform into something with razor-sharp teeth and a taste for human flesh. Extra points for her dolphin-style underwater attack, too. It might make up for the heavy-handed message fiction hinted at in the trailer, but what the heck. I always like to see the old folklore get used without first getting all of the blood and pain cleaned off first.
Comes out on Freeform in 2018. I keep hearing about this channel, for some reason. Weird.