Tuna: Just wanted to point out that this portrait indeed is a step in the right direction, it seems that your subconscious is getting better at doing things the right way. Angularity is replaced with more symmetry and coherent shapes, which is good.
As helm says, though, study FACE! You need to learn more about FACE
(:
Also this is just me messing around with helm's edit in order to clarify that what he means is not that the result you should be getting is the face he drew, but rather that's how much a 'realistic' face differs in construction from the one you drew!
What I did was basically just work from helm's edit trying to find that style that you were looking for, just to further prove the point that knowledge about proportions, anatomy and construction is paramount! Get stuff right before you start playing around with it! Learn the rules before you break them! Yadda yadda!
It looks like fucking akuma though. I might have to do another edit, heh.
I'm not gonna say you have to give up pixel art and come back only when you can draw a face on paper, but PLEASE try to do some basic facial construction on this guy and go from there, showing us the process, so we can help you get stuff right WHERE and WHEN it really MATTERS.
Good luck! : D