Hard to tell from the photos is the solvents in the clear coat reacted badly to the plastic lens causing “crazing” or if the clear just wasn’t sprayed heavy enough to flow out and form a smooth surface. The last coat should be a little heavier so it looks “wet” and smooth when you are finished.
Try wet-sanding the lens again with 600 grit wet-or-dry paper (the black stuff) and then 1000 grit. If a very close look at the surface is smooth and not pitted, respray it. Spray is VERY good light so you can see the clear “shine up” as you get the spray heavy enough to flow out. Don’t get too much or it will run - that’s the tough part.