The heart texture goes in\PACK NAME\assets\minecraft\textures\items\You can also easily edit the heart color in MS Paint or whatever you use The model goes in \PACK NAME\assets\minecraft\models\item OR blockYou will need to rename the model to a TRANSPARENT BLOCK (like leaves, carpet, etc)Or an item if you want to put it on an armor stand`s head or somethingThis model is meant for the 1.9 snapshots
"Undertale Red SOUL/Heart" by SSunday_Nick: www.YouTube.com/c/SSundayNickFTW
Available for download at https://blockmodels.com.com/model/14/
@SSunday_Nick I was just about to upload one of these! You got to it before me :P