I decided to pursue my pixel art interests, so I drew a bust. Comments?

[Korthos]

[Pix3M]

I feel as though you might be spending a little too much effort than you want making your shading really soft. You can get surprisingly far with portraits by using simple blobs of color and harsher contrasts instead of placing many small pixel dots trying to achieve a softer look.

[Zintendo]

Take your hand and measure with your fingers the distance between your eyes/ chin, and compare to the distance between the eyes and top of head. 

Eyes being higher than the top of the middle of the face in your pic is exaggerated stronger than the angle at which it faces, suggests, yet it still looks awesome, you pulled it off.  If getting it one step closer to realism is what your looking for, try moving the eyes a bit.  Otherwise, I know plenty of cartoon characters with the eyes offset on purpose.