So, the version I used was 1.8.9, and I noticed a problem with the ears portion, and a problem with both parts of the mod.
The first problem is that, in 1.8.9, the ears render too high, and don't properly merge with the head. That may just be a preference thing, but that's just what I saw.
The second problem is that neither portion moves correctly when the player crouches - they instead just float in the air as though the player were still standing up.

God damn it past Mojang.