I simply must say something about that Deathstroke animation.
First thing that makes me want to

is different length of his arms.
Second, you have some redundant frames in your animation, the same effect you can achieve with only 6 frames.
Third, Deathstroke is cool guy

by making him slim like stick man you stole his charm. Even if you are scared that you can't draw it as good as you want, at least try. By taking the easier safe way you won't learn much.
Forth, you are using 20 colors here, but we can only see 3 or 4 of them, that's because you are using too much similar colors, and they don't contribute to your image. Use comments you received for Mega Man color and learn from them.
And final, as I said don't be afraid to make a mistake. If you try hard, you will definitely progress. Good luck.
