I'm sorry to be the one to say this but looking at those Metal gear Smash 4 things was just painful. They are nothing but edits of Smash photos where you just pasted beards and bandanas on their heads. I can hardly call that art. The only thing I can even remotely appreciate is that megaman drawing you made.
The anatomy on it needs alot of work. His left eye is much smaller than his right one, his right foot is bigger than his left. There are also other flaws that need to be addressed, but I suggest that you practice human anatomy first before doing some more stuff so you can get an idea of how to draw people. You can post your practice doodles here and then we can help you. Here's a few links to help you out:
http://design.tutsplus.com/articles/huma...ctor-18254
http://www.elfwood.com/tutorial/108c5366...nstruction
http://drawing-tutorials.deviantart.com/...an-Anatomy
The anatomy on it needs alot of work. His left eye is much smaller than his right one, his right foot is bigger than his left. There are also other flaws that need to be addressed, but I suggest that you practice human anatomy first before doing some more stuff so you can get an idea of how to draw people. You can post your practice doodles here and then we can help you. Here's a few links to help you out:
http://design.tutsplus.com/articles/huma...ctor-18254
http://www.elfwood.com/tutorial/108c5366...nstruction
http://drawing-tutorials.deviantart.com/...an-Anatomy