Old mobs look too outdated compared to the new ones, what about updating them? This resource pack make classic mobs look like new mobs and improves them giving other small details.
Select version for changelog:
Changelog
-creepers have a new model and texture.
-new creeper skull model.
-sheeps have a new model and new texture.
-cows are white with brown instead of gray and black.
-the squid model has been fixed.
-added bats, silverfish, endermites and vexes.
-new texture for chickens and a tail was added.
-(paintings) creebet has a dark-green creeper and pigscene has a pig with ears.
-removed the updated spawn eggs because they were confusing.
-new pack icon.
EDIT: i tried again and it worked, so yay i guess :D