I have some tips to really make your drawings stick out: 1) When coloring, ALWAYS color in the direction of the fur 2) Add atleast 2 layers of colors, so it's nice and dark 3) Usually, it's best to have atleast 2 shades of each color to add more depth (goes along with #2) 4) Outline your work in pen. Even better, stop by your local art store and grab a Micron pen to outline
Just some tips, because your art is very nice, but with those tips it'll look stunning.