Any imported skins come up on every player. When someone joins the realm, or If they change their skin, everyone else changes too.

Thank you for your report!
We're tracking this issue in MCPE-48207, so this ticket is being resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki