As other already explained you everything, i'm gonna help you with four things.
First download the right mass marking file, and look if there is the Skull marking.
Second go to
Main Disk/C:/FeralHeart/media/textures.Third copy all the mass marking files, that are with picture.
markings.cfg leave it.
And forth go back to the main FeralHeart folder, and copy
markings.cfg file, and replace it with the old
markings.cfg file.
And then you should go and see if you had it done good or not.
![Smiley :)](https://feral-heart.com/smf/Smileys/default/smiley.gif)
Hope we helped you.
![Wink ;)](https://feral-heart.com/smf/Smileys/default/wink.gif)