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Someone said I must include a hashtag #aiimages, and note it especially if it's a long form blog

Not "must", but it's a good thing to be on the safe side.
In long-form posts (I call them articles), make sure you state somewhere that images are AI generated.
!BBH

Oh yeah I did that. Thanks so much for the guidance

For images in the blog, that is the custom, yes. Some care more than others.

You're profile pic seems less crucial.