you should really try to condense your threads and follow through on a single piece.

you got lots of good replies/edits on your "characterwip" thread, my advice would be to study those edits further and figure out what makes them work so well. the ship in your other thread is too simple to say anything about, really.

regardless of the feedback you receive, what I see as your biggest hurdle is that you lack proper training in the fundamentals, as well as understanding of the subjects you're depicting. Studying human anatomy and working daily on the fundamentals of art (shading basic three dimensional forms, drawing from life, learning about color theory/line weight/ etc) would be the most helpful thing to do at this point.