some clients support an upload, but they upload to a 3rd party and then provide a link. In theory you could base64 encode images and upload them to nostr, but you'd need a client that knows to read them and parse them correctly. Something like that could get hard to keep secure, but it would be cool. I think you could create a channel and have people subscribe / follow the channel (supported by certain clients).

You can upload em in my dms if u want bob