This drawing is extremely bland. There isn't a lot of detail and it looks pretty plain. But this time, I planned it this way because it would be a lot easier to color. I already started to color it and it looks awesome. The colored version will be done in no time. Sub-Zero shows Scorpion his real face so now Scorpion will show Sub what he looks like...
This is great. Its not really bland as you say, it has some nice details in the muscles. The details to Scorpion's mask are also very nice. I like how you gave each their own look, it doesn't look like to ordinary 'ninja' characters at all. But I think this might be more suited to be the younger Sub-Zero, as I don't believe the older one had the scar like that. As always everything is in perfect proportion, can't wait to see it colored.
This drawing is far from bland. It has a lot of great detail to it, but because of the scar, that Sub-Zero can't be Classic Sub-Zero. Scorpion looks great too, but his mask kinda reminds me of Reptile from the MK movies...Anyway, I give this drawing a 4.5/5. Great stuff.
Since everybody already pointed out the good, I guess I'll go with the bad. Scorpions shoulders look far too law for me. Also, there are a LOT of lines that detract from the drawing, for me at least. I think you should try to simplify things a bit.