I did this a while ago after reading some greek myths. I decided I wanted to try and draw what I thought a siren would look like. I chose the demon and angel wings because they look innocent at first, then they turn around and you see how horrid they really are. She's supposed to be (demonically) pretty and kinda scary looking at the same time. I used CG Illustrator for this, just paintbrush and airbrushing. Hope you enjoy.