Only a few characters are still avaiable beside this Sub Zero piece, you saw Jodeee`s Sonya Blade
[link] already i think,with this small tribute i attempt to organize something in a professional quality above the usual game art hq art projects which give both professionals and not so professional ones a chance
The remaining characters are
Kano
Johnny Cage
Liu Kang
additionally you can also choose to draw a MK1 fatality by
Kano
Johnny Cage
Liu Kang
Scorpion
here
[link] you can see the full list of participating artists and what they draw