Change header height

Can we change the height of the header/header image? I wanted to make mine less than 700px if possible.

www.whiteskyproject.com

Hello there,

Thank you for getting in touch.

I noticed that your header image has been less than 700px already. Have you been able to manage it? Please let us know if you still need an assistance.

Regards,
Kharis

Okay, silly me, I just uploaded that image. I guess I was thinking more of applying a parallax effect, but now I realize that requires major changes. Thank you though for responding so quickly.