[odipar]

I want more formal architecture diagrams: how would they look like?

I also want to know whether my architecture diagram is any good?

Is my diagram too detailed, too abstract? Are there any objective measures, or is it all heuristics?

That said, 'loose' architecture diagrams can help you convey an approach, idea or direction. A strict formalism might kill the take-away message.

[splittingTimes]

As mentioned below, C4 is a nice way to do it.

Other then that, as the article mentions, it all depends on the audience and their background/knowledge level. Why not gather Feedback from those your diagrams are intended for?

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https://c4model.com/