For a while it looks good to me. Can you tell us how did you work on weathering? For me it looks like you've used a pastel chalk here.
Some comments:
The panel line on the F/A-18 looks good. I think you've overdone the pastel weathering on this one. I would suggest you use neutral colors (such as black-grey). The decal on the tail looks like it hasn't been masked properly since the blue clouds over it. I've noticed the seam between the fuselage and the wings. You might wanna fill that up. For the afterburners, try painting it with dark metal colors (mettalic grey/gunmetal) and add some silver to show it that it has been used a lot.
For the Harrier. I recon this would be the Airfix, right? You might wanna close again the seam on the fuselage and the fuselage-wing connection. Panel line looks good. Weathering should be toned down a bit since it looks overdone. As for the decals, the decals look more of a "decal" since it happens to silver (the clear edges show). If there are air bubbles, try popping them with a pin then apply a clear finish to tone it down. The balance between the weathering of the decals on the fuselage and the tail seems different. The tail decals looks "clean" compared to the fuselage ones.
All is not lost. I guess a lot of others would help you out.