It is a gorgeous little fox! You did an amazing job on all those details I can see you put a lot of time and effort into it, the blurred background and fox body gives all attention to the face and this is really good. I think you did a great job with contrasts and light sources that makes the drawing look even more like a photography! I love how his eyes look so alive! It actually seems like he is looking and I could say in most paintings I can't see it! Also because the background has more bright colors it really makes the drawing look even more prettier and interesting.
In critique you usually say there the artist could improve as well, not only the compliments, but to be honest I actually can't see any mistakes or places there I would change something. Maybe I'm not at the right level yet thought!
Overall It is an impressive work!