Canon.

now u know that scorpion would burn that thing in to ashes or rip it apart...right cuz that shit right there is a straight up contradiction

cute

lol

Love and Tolerate you to DEATH!
Fun, yup

Alright i'm not going to rag on anatomy too much, I'm sure you already know you need to work on that. But I do wanna make sure you understand that proportions and keeping your drawing proportional with its self is just as important as anatomy.
With good proportions, the character will still look some what good, even if you fudge the anatomy a little.
look at the shoulders, hands and head, they are all off. one shoulder is smaller than the other, the head is quite large compaired to that shrunken left shoulder and the hands are quite small. Once you settle in to a set of proportions for a character, you'll find that if you follow them, drawing the character will become easier and a bit more natural.

Moving on.

The pose is alright, but could be much better. First off. try to advoid cutting off a character at a major joint.The major joints are the hips, the knees, the elbows, ankles, neck, and wrist. You have Scorpion cut off at the hips and it gives off the impression of him having no lower half. This is mostly about composing the picture. By having a better composition the piece will a little more dynamic and less uncomfortable.
Speaking of poses, a suggestion is to take his right hand and turn it in a little. Show off more than just the back of the hand. Get some of those fingers and a little of the side in there. Again this will be more dynamic and interesting to the viewer. Sure its a hell of a lot harder to draw this hand gesture, but its a hell of a lot more rewarding in the end.

In to the lighting we go. Simply put, you need more. no worries. I intend to be a little more in depth.
At the moment you have some very flat shading. You need to get some highlights in there and a couple more levels of shading about the character. Try and think about the character as a 3 dimensional object and how the light falls on to him. Also try and think of the textures in the picture and how they cast shadows as well.
The skull on his belt could really pop out with some really good highlights and a couple levels of shadows.
Drop a red dot or something in to the composition on a new layer and treat it as your light source. It'll help.

One last technical thing I want to point out is the line weight, or the thickness of the line art.
Much of your line weight all the same. That makes is motionless, stiff and boring.
Use Google image search for "Line Weight" the results do an excellent job of illustrating the entire concept. but one in particular is this little gem.
http://www.tomrichmond.com/blog/wp-content/uploads/2009/12/img358.jpg
its not just using line weight for dynamics and weight, but also to show some lighting. A really excellent example indeed.
Now back on track. Varying your lines can add a lot to a picture. it can really add presentation to a character. . To add weight you.... give me a sec, its been a while since I have had to explain it... It.. just comes so naturally now, er.... Quick to the GOOGLE!

Yeah... the more you learn and more you do, the more natural these things become... which obviously means you forget how you actually did it in the first place... Yep all the illusion of be mysterious being known as Artist...
"Enough Rambling you. Back to explain!"

Ah yeah.. this explains it well enough. its about pen pressure and the motion of your pen/pencil. getting more expressive and heavier lines on strong curves.
http://drawsketch.about.com/od/drawingglossary/g/lineweight.htm
Be sure to study some of those google pics too. they will help you understand a bit better than just a plain block of text.

On a parting note, your Dash is actually drawn better than Scorpion. It has better proportions and everything. Not bad. could use some lighting though... and less creep eyes....
er yeah.

Well Bro-hoof-out everypony!
~Kinsei