Start with a circle, about 12 segments will do.
You can bring the pic in and set it as your background image.
A to highlight all, extrude, pull out a bit, scale, extrude, pull out scale, repeat till you get to the other end of the hull!
Go to object mode, Then make another circle (so its a separate object), scale it in one direction so that its a very squished oval. Swap to edit mode and then do the same as you did for the hull of the rocket, but your going to make one fin. Extrude, pull out, scale, repeat till you get the shape of one fin.
Go to top view, swap to object mode. Highlight your fin. Line it up with one side of the rocket at at a 90 degree angle. click in the center of the body of the rocket so the cursor is left there. swap to the cursor mover selection tool. Now click on the fin and hit ‘Shift-D’, then R and 90 till you get your 4 fins.
Go to the modifier’s window and select each of your objects and set it up with a ‘Subsurf’ modifier.
Next go to the materials tab, whack a Blinn on there, up the speccy and start messing around with toon shaders.