Wow.. simply wow. This looks very realistic! I love how detailed it is that you can see all the little hairs all over the cub's body. How long did it take you? I recently switched to pastels and LOVE them. But making all the little hairs must have been a PAIN.
Good lord - you should be happy with the outcome. I do a lot of drawings of big cats (lions, mostly - check out my page if you get time), and to do something of this detail and maturity - by which I do not mean that of the artist but that of the quality of art - is incredible, but to do it in pastel is unbelievable. My personal weapon of choice is colored pencil, but I tend to work fast and bring unexpected colors to a piece rather than the kind of detail you bring. Very, very nice piece of work.