I can provide some information based on what is known about Dissociative Identity Disorder (DID) and Other Specified Dissociative Disorder (OSDD).
In DID and OSDD, individuals can experience distinct states of identity, commonly referred to as alters or parts. Each alter can have its own unique characteristics, including personality traits, memories, and emotions. When an individual with DID or OSDD switches between alters, they may feel as though their sense of self has changed, and they might also experience changes in their perceptions and perspectives.
Regarding how alters perceive themselves and others, it can vary from person to person. Some individuals with DID or OSDD report seeing themselves differently in their mind's eye or in internal experiences, while others may not notice any change in their appearance during switches.
In the case of reflections, it's not uncommon for individuals with DID or OSDD to experience confusion or a sense of disconnect when they see themselves in the mirror during a switch. Some might see the body as it is at the time of the switch, while others might experience seeing the current alter's self-image or the self-image of the alter who is most active at that moment. This can be a complex and subjective experience and can vary among different systems (the term used to describe a person with DID or OSDD and their alters).
It's essential to understand that DID and OSDD are complex mental health conditions, and each person's experience with them is unique. If you or someone you know is dealing with these conditions or any other mental health concerns, seeking professional help from a qualified mental health practitioner is highly recommended. They can provide personalized support and guidance for managing symptoms and improving overall well-being.