Hi, Russo, may I show an idea i used on my Noseintake planes like the Ye-152 and La-200, the whole body shape of those birds are way less complex than the one of a Harrier, so I tried this out to have a more smoothed front and rear of the fuselage, so the rest is nearly low poly, but the result looks good.
Here is and example of your nose section, the yellow lines are the polys you used, the reds are the one I would put in. Its not a huge poly increasy but smooth the nose a bit up with uot redoing the mapping ;)
what do you think?
here is the way I modeled it, I try to have areas like intakes, nose and cockpit as detailed as possible cause they are the areas you are looking most of the time at them.
Its just a sugestion, hope its ok for you I post it here ;)