What an awesome expression! It has a trusting, content feeling about it.
I think shooting from a slightly higher vantage point would have included more face and less neck. I like, though, that it’s a profile shot, and not looking directly down into the face. What aperture were you shooting with? I think more blur in the background would have been nice.
The image is too small to know if it’s truly sharp, but it appears to be. Technically speaking, the image appears to be slightly underexposed and the white balance slightly cool.