You reminded me of this
https://www.programmableweb.com/api/deep-art-effects-style-transfer-enterprise-rest-api-v1
that links to https://www.deeparteffects.com/service/liststyles?e=1
But the main thing is that the main site programmableweb contains api’s to many image resource tables… could be a use for you as for unisplash I had seen it but wasn’t sure of the results I’d end up with.