Ok chief heres a reply!
Perspective is way off!
Use more foreshortening!
Lots of lighting issues!
Use a reference. Acctually get someone to take a photo of you from a similar angle and use it! Never really a good idea to do a sketch of a sketch. Cause then you just have an impression of an impression. If that makes since.
Will give you credit on the moon and sky right above him. that looks nice but below him is just thrown on.
Main thing I can tell you is work on perspective and foreshortening.
"the earth speaks to all of us, and if you listen you can understand it."