I really love the expression and emotion in this piece! You can obviously see how concerned and scared Pumapaw is.
The snow is beautiful and very well done, it looks very soft and realistic. The shading is good, too, though I'd love to see you experiment with some subtle blending. I would suggest putting a bit more detail in the grass in back, it looks sketched out and unfinished, it would tie the piece together if it looked full and had some defintion, sheen and/or shadows.
Puma seems to have too many wrinkles, I personally think. I know it is part of her design, but it looks too harsh. Try using shading to show wrinkles rather than black lines, maybe? As if it looks almost as if she's hairless or covered in latex. Jaws a bit big for face. Beautiful piece, though, overall. Lots of emotion and lovely background- I love how much thought you obviously put a lot of thought into the way the pair are both feeling.