Help With Face Shapes?

I've been told by two different hairdressers what my face shape is. One says oval and the other says heart. Does anyone know of good pictures for reference of both shapes? I need to know as I'm getting a wig for cosplay... well, it's hard to explain why I need to know my face shape for that but I do need to know. So if anyone has/knows of trustworthy pictures of both oval and heart shaped faces.... post 'em!