All of the mobs are standard (except skeleton horse and mooshroom (some small changes)), but with glowing eyes, so it's easier to see them in the dark (also looks cool).
Also at some reason horses won't accept the textures, so they currently without glowing eyes (i think that this is OptiFine bug or something)
Use OptiFine for this texturepack.
For better experience use shaders.
Feel free to use in any resource pack, just do not republish the textures as your own work.
Currently texture pack is for MC 1.12 - 1.12.2 in future i will add the support of newer versions of Minecraft or also mod support.
Write your ideas and suggestions in the comments.
Thanks!