New short story

I finished a new short story I have been working on. Here is the first paragraph:

Every night after she takes Ch00 Ch00 for a walk, she strips naked in her bedroom and takes a photograph of herself. She has done this each night for the past six weeks. It's the only use she's found for her outdated digital camera. She stands in the same spot in her bedroom and looks straight ahead at the camera, set up on the dresser so that it photographs from the neck down, so her face is in none of the photos. She's learned to download the pictures onto her computer, where she can scroll through them like a timeline. She can see the changes. Like a primitive cartoon, her body flickers down in size–her breasts begin to rise, hips begin to take shape, and her legs whittle away. Her fingers are even smaller, elbows no longer rest against rolls of skin on her sides – there's actually a gap, a space between elbows and hips. Black triangles like the isoceles of brown hair below her belly. Her belly button is no longer a gaping orifice – it's almost cute. In a few weeks she will send a photograph to Mickey of her face. After she loses ten more pounds.

You can read the rest of the story here.

If you get through it, let me know what your take is on the narrative voice. Too condescending? Too detached? Inappropriate humor/formal voice/switch in tone?