A smelly question

[Tailwind]

After working on the engine earlier this week and getting under the car to drop one of the panels to find the socket I dropped in the engine compartment, I believe I don't have any leaks. That said, can y'all chime in on what might be the source of a smell I can detect when I get out of the car after being driven fully warmed up. My buddy noticed it too. It's not quite the 'oil on the manifold' kind of smell, and I'm thinking maybe the PS overflow. Any comments on what's common?

tia