what you see in your mind , might not be what the person that created the image sees in theirs, your lights should be brighter, the shadows are to dark...maybe the lights and shadows are exactly how the person intended them to be. Basically the constructive criticism here is telling another person, how you would like their pic to be done. If you like the pic fine, if not move on, unless asked for critiques. This is only on my own experience, but those that have left criticisms for improvment on my pics,should be asking me for help and not offering it. Just being honest, i know that's not popular here these days. :(