Hi you said you need to display pictures outside Salesforce, could you give further details in terms of how these pictures are being sent to the external page?

I am asking because i did something in the past and it worked. In my case there was an external system that connect to our ORG and it was collecting the image through a custom REST API and the thing I did was convert the image (ContentVersion record) into base64 format and sent to them, after that they needed to decode it as image and then use as intended. Not sure if this would suit to your cenario.