I have some images from a past project I'd like to include in my portfolio, but I'm not sure what the legalities of this is. Do I need a written consent from the person I sold my services to? Or am I free to include it in my profile with watermarks?
On Upwork, once you're paid for your work, your rights to it are transferred over to the client. To use images of the work, you'd need to ask for permission (unless you've agreed to different terms regarding rights or portfolio usage). tl;dr best to ask your client