Since there are tons of fakes out there, I think maybe doing something with the lifebars, changing them and giving them your own thing might improve it to make it more original. The background is awesome and the fog or smoke? looks good too. Lui Kangs legs look weird. The blood could have been a bit thicker. Overall Ill give this a 3.5.
It's a cool lil theme. I agree, it does need a bit more color and changing the lifebars could really help. If you change some of these things, it could really be tyte.