I like it. Its a good idea, you ever throw a ribbon emitter on the thrown spear? Might help it as a projectile, to leave a visible streamer behind it like almost all other wc3 projectiles, other then that I wish you had found a way to incorperate the sirens tail, perhaps snakeing or spiraling down or around the dragons tail, or even dangling down one side of the dragon. the sirens tail is a very characteristic body part of the siren and not seeing it there makes me sad but also made it hard for me to tell it was a siren at first. Other then that I think it looks good.