You should extend the wings out side to side by about 35%, and extend the nose of the plane front to back by about the same amount. Of course I can only guesstimate from looking at the screenshots. Hard to really know how much :P
Depending on how close you wanna get to your reference, you'll need to extend the nose of your plane. Also you should extend the wingspan of the plane, as right now your horizontal tail fin things are almost as wide as your front wings.