Here’s how it should have gone:

photographer waiting for good lighting

Embassy doesn’t feel nervous because they have at least one iota of experience observing humans

Another pretty good scenario:

photographer waiting for good lighting

Embassy: Hey why are you hanging around out there?

Photographer: oh I’m just writing for the light to good for this very common tourist photo opportunity

Embassy: okay, but please don’t take photos of us

Here’s another situation:

photographer waiting for good lighting

Police: Hey we got a call that you’re loitering here, and it’s making people nervous. What are you up to?

Photographer: I don’t think I need to explain myself, it’s pretty obvious I’m trying to get a good photo of the very common tourist photo opportunity.

Police: okay just make sure you’re not blocking the sidewalk.