Good question! I'd say just credits, and as always dont remove the signature. As long as people know its not your lines I can't see any issues. As someone who has streamed this myself thats all I did.
If you're worried bout like revenue and copyright, I'd say you're ok as the stream is you colouring and showing your process, you're working and such. I'm not a lawyer or anything though aha but i'd argue your colouring in would be transformative enough.