My crit...is starting to get repetitive.
VOLUME.
uh....you have got GREAT lines. it seems in small sprites since you dont put as much detail you do fine. But the bigger you go, the more overcomplicated it gets, and the more you screw yourself over.
You shaded the new portrait with ridiculously excessive AA, it is so much it starts to be pillow shading...that's a frist!.
it seems you do all the shading to make the AA look good and to emphasize anime trends (the speculars, the shadow on the hair) stick with the basics, and then go for the fancy stuff. your sketch has better volume than your sprite, not because you do the texture wrongs or anything, because the sketch is clear, everything is there to show volume;form. Your shading is more like a bunch of misinformation, it implies a bunch of things that arent there. Not to mention you royally changed your design...I get the impression you use a mouse, if you have scanned something in DONT change the lines with mouse, your pencil lines are always more intuitive and show better form.
(Capcom's Pocket Fighter Portraits)
I think trying a style like this would do wonders for your work, might be a little off track but you could try this and THEN add outlines and AA and all your usual stuff.
BTW, you're not DarkfalzXL are ya?....the way you shade big stuff is starting to remind me.....nah, he wouldnt say he is bad at animation but DAMN