I usually add a comment - “Is there a specific organism in this photo you are wanting to identify? iNaturalist is for observations of plants, animals, and other organisms. If you need some more help, be sure to check out the Getting Started page: http://www.inaturalist.org/pages/getting+started and Frequently Asked Questions: https://www.inaturalist.org/pages/help ” It kind of hints that those aren’t really the types of observations that iNat is for.
(The second half of that response comes from the Frequently Used Responses page: Frequently Used Responses · iNaturalist)