The nose of the fuselage is flat on top. Making it a bit more rounded improves the airplaneās appearance.
Improve the curvature of the top front portion of the fuselage:
 Click and Ctrl+click to select the three ridgeline edges in front of the cockpit, and the ridgeline edge immediately behind it.
               
 Move these edges up vertically a bit, to make the fuselage more rounded.
                  Front view
Increase the curvature at the top of the engine cowl:
 (Vertex) sub-object level.
            
 Click and Ctrl+click to select the three vertices along the top of the engine cowl.
 Move these vertices up a bit, as well.
                  Front view
 (Vertex) to turn it off and exit the Vertex sub-object level.
            
 zoom out and press F4 to turn off Edged Faces.
            
 Edit panel, turn on 
 (NURMS) once again.
               Now the fuselage is convincingly rounded.

 (NURMS).