We propose enhancing live 360 panorama-based Mixed Reality (MR) remote collaboration through supporting visual annotation cues. Prior work on live 360 panorama-based collaboration used MR visualization to overlay visual cues, such as view frames and virtual hands, yet they were not registered onto the shared physical workspace, hence had limitations in accuracy for pointing or marking objects. Our prototype system uses spatial mapping and tracking feature of an Augmented Reality head-mounted display to show visual annotation cues accurately registered onto the physical environment. We describe the design and implementation details of our prototype system, and discuss on how such feature could help improve MR remote collaboration.