This is the type of face shape I've had most queries about. For this face shape wear your hijab quite loose around your cheeks, if you wear your hijab too tight around your cheeks in an attempt to 'hide' them, it'll only make them stand out more, so wear it loose and draping. The draping also make your face look narrower. Avoid wearing your hijab too low down on your forehead as this will also make your cheeks stand out more. Don't pin your hijab under your chin because again this will bring your cheeks out more.
Read more: iHijabi: Hijab style's to suit your face shape http://ihijabi.blogspot.com/2011/03/hijab-styles-to-suit-your-face-shape.html#ixzz2d4ZLfLPC