I see the distance between the eyes as a stylistic choice, so I think it looks good as is. The AA and stuff is good as well, so nice work
I did an edit:
Kinda blows the whole four colour thing, doesn't it? Anyway, I forget everything I changed, but mainly it was an attempt to break the mirrored look. I changed the shadows/highlights under the eyes, the nose (the line straight down the centre really made the mirrored-ness pop out). I also added some highlights to the lips, nose, etc. I don't think I changed too much else, 'cause AI actually quite like the original lines.
I dunno, there's probably some other stuff I mean to say, but I forget it. Hope this can be a bit helpful at least.