Any idea how to add the thorns?
One way is by hand. The other is to set a particle system to a vertex group where you want the thorns and make it an object instead of hair. Another would be an array modifer. Depends how many thorns and how you want them distributed
You could easily add a Particle system to add fine hairs then add the thorns by hand(or particle if you want a bunch.
Looks good. I would vary the color just a little though.
ha! Brilliant design. Love the look of this luchador 
Awesomesauce. The only other thing I’d suggest is to use weight paint to keep the thorns from growing though the eyes.