If you open your photo details, you can see if any given photo is used for any taxa. But that doesn’t help you search for which of your photos are used.
you can sort of look this up through the iNat API. you would first get a list of the taxa you’ve observed via https://api.inaturalist.org/v1/observations/species_counts?user_id=pttrsn, then get information for those taxa via https://api.inaturalist/v1/taxa/{id} (replacing {id} with a comma-separated list of taxa). that will provide information that includes the taxon photos (and photo owners), which you can parse through to look for cases where you’re the person who took the photo.