Just an OWL sketch for possibly inferring some BibFrame details from other details...

illustrated-text-class.ttl

prefix : <http://www.w3.org/2002/07/owl#>
prefix bf: <http://id.loc.gov/ontologies/bibframe/>
prefix kbv: <https://id.kb.se/vocab/>
prefix marcrel: <http://id.loc.gov/vocabulary/relators/>

kbv:IllustratedText a :Class;
    :equivalentClass [
        :intersectionOf (
                bf:Text
                [ a :Restriction;
                    :onProperty bf:hasPart;
                    :minCardinality 1;
                    :someValuesFrom bf:StillImage ]
            ) ;
        ],
        [
            :subClassOf [ a :Restriction;
                    :onProperty bf:illustrativeContent;
                    :minCardinality 1 ],
                [ a :Restriction;
                    :onProperty bf:contribution;
                    :minCardinality 1;
                    :someValuesFrom [ a :Restriction;
                            :onProperty bf:role;
                            :hasValue marcrel:ill ]
                ]
        ] .