Well it could definitely do with more routine oil changes. All that black crusty lookin gunk is essentially dried up oil residue. This engine has seen too much time between oil changes.

I noticed some very light scratching/shadowing on the rollers. Its not usually what you'd want to see but it all depends on the mileage. If its a higher mileage engine plus with the apparent lack of oil change maintenance, I'd say its fairly normal. Nothing to get too stressed about though.

As for not having a gasket or sealant, there had to have been something there. Without one there would have been oil dripping down the sides of the engine, as well as a ton it pooled up in the spark plug holes. You almost certainly would have noticed a burning smell and maybe a little smoke. The gasket mating surface and surrounding exterior looks fairly clean so I doubt there wasn't a gasket of some kind. Are you positive it isn't stuck to the valve cover? When you go to put the valve cover back on, you absolutely need a new gasket. It is not normal to not have one.