I don't have a picture I can show you but it probably wouldn't be visible if I did anyway. It should look like a hazy, translucent film and have no ridges, blobs or any features that visibly suggest thickness in any way.
It's pretty much impossible to make it too thin. If you apply too little you'll get uneven coverage, missing some spot and getting others.
It's important to get even and complete coverage so you'll get best results going over any point at least twice. That's why you overlap passes by half a pad width when using a buffer. The same goes for hand application.
PC.