I'll probably say a few of the same things Kat has stated, but it's all in critique.

Shading - Could use a variation of dark and light, not two shades of a basic gray and white. Try drawing a still life - cups, plates, glasses, guitar, really anything that is inanimate using pencils or charcoal on sketch paper or anything like it. Whenever practicing drawing, you always start on one focus and move to the next. Currently, your drawing skills are pretty good. I'd suggest working on shading and lighting - as said before try drawing still life it will help give you a sense of lighting towards an object. Look up images of animals in sunlight or dramatic lighting, to see how light effects the fur. Always draw what you see - not what you know how the object feels like.

If you notice, I put a dot on the top right corner of your original drawing. It's hard to see where the direction of light is hitting on the pose - Here's a few links to some guides about basic cell-shading and shading in general : http://th02.deviantart.net/fs71/PRE/i/2013/114/a/b/redline__notes_on_cel_shading_by_fyuvix-d62uljz.jpg , http://fc06.deviantart.net/fs71/f/2009/363/0/4/Basic_shading_tut_by_griffsnuff.png

Fur - Fur is really free flowing, it's literally a "spirit" all its own. When drawing fur, look at images of long haired canines to see the direction that the fur goes, also looking at images of wolves help too. Let your hand move freely when drawing fur, make it free flowing like the fur itself. I can see you're trying out a cell-shaded approach to this pose, cell shading can be hard to do when you first begin. But, when used correctly drawings can look flawless -http://fc02.deviantart.net/fs71/f/2012/320/3/4/it__s_a_doge_by_kaylink-d5l889y.png. There's nothing wrong with cell-shading but learning how to accomplish it will take time. I suggest studying other artists work of animals and how they might draw fur, another possible thing is to watch livestreams of either traditional or digital artists to see first hand what they do in their work. Do not copy their artwork (Not saying that you would) - You can try out their techniques in your own drawings, and make it your own.

Anatomy - Your anatomy is pretty well done, there's just a few small nit picky things. As Kat stated, the front legs seem too muscular in proportion to the paws. The arm itself becomes more narrow as it goes down to the wrist. The hind left leg seems out of proportion to the right hind leg, it's significantly smaller and doesn't seem like it fits. Again, look up images of canines (or felines depending on what you're drawing) to see proportions in respect to how the animal is standing.

Another small thing (it isn't such a big deal with poses but often times shows a sense of depth and perspective), profile views are always easier and often boring when it's used too often. Try changing the viewpoint and depth of a character - think of a movie scene and the angles cameras can capture. I know being a pose for a site it's always significant to do a profile view, but at least try to change up the perspective in your sketches/experimental drawings.

About the shading, my OC Alea is as white as that ^^'' The grey is the shading, and it isn't drawn on paper but digital.The light is hitting from the other side and a lit' bit up front, but it's not very light. And being me I try all kind of things at once, I always try out a new shading style so I don't really stick with one shading and sometimes just mix it up. http://sta.sh/01nz03w0uuqzAbout the fur, it's my style of drawing fur - I always draw it like that. Really xD I might change it one day but I will do that once I'm ready and I can draw better - but for now I'll stick with this fur style.And I don't really use references when drawing, I used to but I stopped doing that since I wanna improve on my own, and it made me go from this http://fav.me/d7mxfzx to how I draw now. I'm aware of the too muscular front legs, and I must say I had a lot of trouble with it when drawing - I'm glad I changed it again before beginning with the shading, however. Since it was a bit more thicker at first.I drew the hind leg smaller because it stands further away, and not close to the other leg.I try different poses all the time, or try drawing from a different angle then I'm used to.- http://sta.sh/0c2ugozco6w - http://sta.sh/028q16rvpzpj - http://sta.sh/022a78vztu7t - http://sta.sh/0ydidu438sqhope that explains enough x3

Okay.. I don't think you understood exactly what I said. Referencing other people's work isn't really copying, it allows you to experiment and try techniques you've never done before. Whenever you try to draw for yourself, it isn't always the greatest outcome. I taught myself how to draw, and continue to do so. Sure, I've referenced a few artists but that doesn't mean I completely rely on their techniques. Referencing other artists will allow you to improve on your own, you're doing everything on your own when you draw and try new techniques. I have gone off and done a few things for myself many times, but sometimes referencing can help even slightly.

The shading is only two tones. You do realize that shading has more tones than just one. Darker - Dark- Medium - Light - Lighter. Doesn't matter if your OC is all white like that there is still going to be a range of dark and light. Shading helps form the character making it pop out from the page, this what you did makes it look flat. 

-I'm pretty sure I know the difference between traditional and digital.-

Regardless have it your way and ignore everything I said beforehand if you can't consider my critique helpful, otherwise I've just wasted my time for nothing.