Siren sketches

Want to draw a monster girl, and take idea from my friend to draw a siren. From the myth it say a creature like harpy with human head and bird body, who allure a sailor and devour them umm (literally and lewdly?)
but I draw the undine ver.
the undine like a mermaid, But I draw the legs with tentacle like a kraken who pull a ship to the bottom of sea. So with her song to allure all sailor and pull them with her leg that was the idea =w=