While they many not be the best compared to abysswolfs stuff. It does look very good, my personal favs are Ichigo and Bomberman
Keep up the good work

Colors are the main reason you can't find much success with the AbyssWolf style.

AbyssWolf uses a lot of hue-shifting on his piece, having purple-ish shadows (blue-shifted,) and bright highlights (shifted to yellow.)

AbyssWolf also uses anti-aliasing to merge his colors a bit better when doing larger pieces such as portrait art, which is what you have done with those 4 characters.

Lastly, he has very high-contrast use and the dramatic shading aids to how dynamic the characters are.

Attempt to use all of these things and it should help you greatly.