The link to the image in your source code links to this image – http://www.hazelmagnussen.com/wp-content/uploads/2014/03/Go-North-Young-Woman-300×308.jpg which is 300 x 308
What do you have your image size set to in your Genesis Settings page? Once you have that set, make sure and regenerate your thumbnails using the Regenerate Thumbnails plugin (it will automatically adjust your images). You can add more image sizes in your functions file (just look for the other image sizes and add your own).