Banner won't be visable, please help!

Hello guys,

I’m trying to make a simple website by using this free template called “Hatch” and want to use the same layout as they use, looking at this picture: http://s27.postimg.org/swnvz8jmr/theme_sample.jpg

I’ve uploaded my “banner” but it doesn’t appear and I don’t know why, see image: http://s23.postimg.org/vbcs7u4p6/banner_error.jpg

My website is http://www.nicheandmustash.co.nf

Can somebody please help me? Thank you a lot!!