@Yulife You forgot to make a texture for the mine entrance in the winter block.

Going to close this, I had a look at the winter mine in winter. Currently while the textures are nice. It doesn't look right with the overlays and the blocks. So I am thinking, I am just going to leave the winter mine for now. I will still have better loot drops in winter. And honestly, I would actually like it to have it's own theme, with some ice floors and own mobs, so when I do add it. It will be it's own dimension not the existing one. If I'm going to do it, I want to do it right. And not just reskinning the current one in winter.