If this is one of your first models, I think you are off to a good start. Looking at this model there are loads of problems, but many you can learn from. Is this a stylized version of Mystique from the X-men movies? What software are you using?
Issues I see:
Female anatomy problems (neck, breast and waist hip ratio)
Facial Features are mangled with the texturing
No eyelids or illusion of eyelids
Good start though....I highly recommend scrapping it. Learn from it. Make sure to gather up your references before beginning again. T-pose should be changed for a more subtle pose with the arms and chest being t-pose exaggerates the human form. Very wise to start with an orthographic to get the silhouette right to begin with. Don't texture until the model is complete.