Awesome job Walid. Some really good progression in your book. You most recent update is the bomb. Your enviros are coming along really well, but I feel you should take a new approach to your SPs. I feel that you should take planes more into account, and get some tone down.
This will help you understand the form more, and help project the structure. You should try and break some lines at places to show where it is really light, as I doubt there is a solid outline around your eye in real life.
Again, the SSG is a wonderful idea. Keep up the good work.