If you're just doing a scenario, you might want to try not even using life bars, since you're telling a story, not recreating something from the game.
No shadows on this board, or any pit level are okay by MK standards. None of the games included shadows on the pits until MKD.
Made the spear yourself, how? It looks like you just turned it blue. not that you made it. It follows the same shape as the spear has always had.
The Scorpion sprite is iffy, and you didn't make it. Midway did. You simply put two different sprites together and didn't do it very well. If you made the sprite, Scorpion would look different from his in game incarnations.
The idea isn't a bad one, just like most stuff here, it needs work to look good. Flawless victories get old if you do make fakes. Try making Scorpion beat up a bit too. Do you really think Sub-Zero would never get a hit in?
The spear would look better going through Sub's torso and out the other side. Right now the effect looks unfinished, or almost as if Sub is repelling the spear. All because the tip is sitting over Sub and not in him.
If you are going to use life bars, add a timer and everything else to make it look right.
Still just a copy and paste job, even if you did redo the spear so it looks frozen. You should probably try having some ice dangling from it to give more reference to it being frozen too.