This is from a strictly technical point of view, 
Drac knows far more than I about the way the 
character's done in the series.

1: Eyebrows are wrong.  He's at a 3/4 but the 
eyebrow that's raised comes more towards the 
center of the face than the other one.  You need 
to shorten it width-wise

2: Cheek line-  You had the same problem with 
your tasuki cel (jaws and cheeks are hard! 
they're the thing I screw up on most too) While 
the cheek is about right, the jaw to chin line 
goes over too far.  He's got an actual nose 
unlike a lot of anime characters so an easy way 
to fix that is to take a ruler and line parallel 
to the shadow line of his nose to bisect his face 
and figure out more where the point should be.

3: speakin' of the nose... fix that highligh!  
The top should curve more towards the far eye, 
and it shouldn't end at the tip like that.  You 
make him look like he has a very long narrow 
schnoz that's off center that way.

4: Drac was right about the eyes being off, but 
they're also off because the eye on the right is 
lower than the one on the left.  The shape's off 
too.  One eye is square shaped with the inside of 
the eye at the same level as the top corner, the 
other one is sloped down so the inside corner is 
lower than the edge top corner. But the eyelid is 
drawn the same way on both, so it doesn't look 
like one eye is squinting, it's just one eye 
belongs to a different person.

I think I've mentioned this before, but a good 
easy way to find all the little problems is to 
take the picture and flip it.  The other way (and 
I know I've told you this one before) is to let 
the drawing sit out of sight for a few days and 
then take a good hard look at it--which is pretty 
much the same thing you do when proofreading 
something you wrote too.  

^_^ My fingers are tired.  I attached a fliped 
image so you can see what I'm talking about.