Is this regular chain/pulley noise or is there someting I should check/adjust? Extra images

I'm 99% certain the noise is coming off one or both of the derailleur pulleys, but not sure if it's to be expected or if it's irregular and something that should be fixed?

Edit

Just remembered - I tried removing the back wheel (including the cassette, obviously) and the noise persisted, so it's 100% certain coming from the pulleys. I just can't determine why, but I wouldn't be suprised if that's how it's supposed to sound.
The drive-train is a bit noisier than it should be.

The noise is not being caused by derailleur indexing being off though.

Chain seems clean, is it lubricated properly?

Things to check are chain and cassette wear. Also check that the derailleur jockey  wheels are running freely.