Sketch- The Armored Invader

Hi guys n girls
so very often happens that i have an idea....i fail to do it....depression......cancel all the file and give up on it..... typicall stuff , nothing new , except that this time i tried to go back and continue it.
This is actually 1 piece over 3/4 of a final work that i ll put all togheter , hoping that i can finish em.
This is a pretty sketchy drawing... because i m tired and stressed by a lot of stuff these days.... sorry

Any  advice , tips , suggestion , criticism by anyone is welcome  .
you can help me to improve  .

feel free to comment and fav