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).