just send your skin here and you'll be in my next deca city wallpaper
(i just don't have anyone to put in my wallpaper except faceless cops and steve recolors)
You can place surfaces on the face of a character to make something like that. Some people, as ThatGuyBrian said, use item sheets and make the use of the 3D item feature to make 3D things such as ears, 3D swords, 3D hair, and some other things.
I have a passion for deca city conflict wallpapers for some reason, and here's another one i made.
By the way, the medkit is based on sketches i made for Deca City equipment.