This is what the skins look like, I don't know if they load, etc.
winter delta
This is what the skins look like, I don't know if they load, etc.
And this is that they load correctly in my premium account and the .png files are working fine.
tame plover
Sorry, but offline mode is not supported. Especially when it's about skins. If you're able to reproduce it on online-mode server then please leave a comment here.