It's not bad at all.
Like it was posted earlier, I would go check out YouTube for some quick tutorials on different techniques, especially if you can find some by artists that you like or want to pick up a few tips from. I've personally picked up a lot just bouncing around DeviantArt and from Bobby Chiu's YouTube page.
Another thing that will help immensely is the use of reference material. It gives you ideas and opens you up to new thought processes to accomplish what you're trying to birth through your art.
A quick run down on this piece in particular, starting with the "needs improvement" stuff
Mileena's Uniboob, it looks like something out of an old MMO where the characters poly's were drastically reduced to allow more avatars onto the screen without slowing everything down. Give a bit more definition between the two puppies there so they look like individual globes
. The hair is heavy looking, much like the hair in MK games :O and it's something I've had issues with a lot myself. Try to give it a lighter, flowing/organic feel. Don't paint it on so heavy so that the ends actually disappear into the rest of the piece like a single strand of hair would. The overall image has a lack of depth and cohesiveness, this is created by painting the image in separate pieces, instead of as a whole unit. The worst portrayal of this is Tsu Hao's chest piece, it looks like it's out there on it's own not wrapped around the body properly. I honestly prefer to work in black and white, then colorize my images, working on the entire piece, starting out loose and unrefined, and just tightening up the image as I go, adding details so the whole thing fits together. You also create that feeling of disconnection because all of the colored sections individually are very sharp edged, while the lighting and shadows are very soft and blurred.
Good things!
Both poses are very dynamic, and while the anatomy may not be perfect (mine never is...) the viewer is unaware of this because of the emotion both characters show through their body language. The blood looks like you've spent a bit of time on that, the extra detail really shows effort. Your choice of color palette is great (this is something I struggle with constantly, it's why a lot of my full paintings lack pop, when the individual pieces of it look awesome when they stand alone) and really gives off a very aesthetic feeling.
One other thing, just a tip, play with your brush settings, have fun and figure out what can do what. Using "Screen" on that laser will make it look much brighter, much faster and really give it some life.
All in all, it's good and I'm by no means trying to tear you down. Keep up the great work!