Considering this your first digital and done with a mouse, it's really good. I can't even do a body. Now for my tips.
The eye was really good, it's probably the part I love the best.
The head is a little disproportional, but that can be fixed with practice.
The neck is a little to long, but at the right width, and the shoulders are very good, equal on both sides, or as close as it can be.
The collar bones are a little too big.
Her chest is a little weird to me, only because they don't show much shape, only that there is something there. It makes her look like they are slightly saggy.
Even if she's a child, you can add a slight curve to her body, but only a little so its obvious. The ears are in the wrong place, mostly because they need to line up with the tip of the nose. If you look at anthros done correctly, and creatures, the ears start at the nose.
Hope this helped!