i like the brightness and intens colors
and i am a big fan of sub zero
realy cool job
the only comment i could think of is the size of subzero
if he was a bit bigger, you would get more of that "VS" feel
now he has a bit of small role in the picture
you know like main and support actor instead of two main actors (hard time expressing my self as being not native englisch)
Really nice work, the only thing I could add to the above comments is I don't get the flames off the hands going in different direction then the feet, I don't know this subject so maybe I don't understand the composition.