Ok, lets back all that up a bit. Are you using an image plane attached to your camera to trace your curves? (bad idea) Or did you set up a polygon plane and texture the image to that to trace your curves? If you use an image plane attached to your camera, youll find that when you zoom in, your work scales properly but the image never does. Search in our helpful tutorials section. If i remember correctly, one of our gracious moderators has posted a free tutorial on 'Image Plane Modeling'. If its not there, then one should be easily located on the web.