Easy Radohead went on the decline. Though Kid A and Amnesiac were good albums. Actually I would say the decline started around Hail to the thief which should of been kept at 12 or so songs! Probably more like after the year 2000!
In the Karma Police video you can see he doesn't have a lot of density, as if he was a diffuse thinner. And if you watch other videos from the 90s you can see that too.
But I actually think that's how his hair is, he just doesn't have a lot of hair. I think that maybe he started diffuse thinning very young and stopped early. In recent years he wears his hair long and I think the longer hair makes the front of his scalp look less thin.
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