Hey, and thanks for the review!
If you're talking about the blacker lines right in the middle, you are right if you look at them from close up. I personally think it looks way better if you look at it from a bit further away. I didn't intend for this to be photorealistic anyway, so especially with the hair, I just did whatever I wanted to (not all of the hair was included in the drawing I used for reference).
Also, as I barely ever draw, I tried to keep as many elements as close to the original picture as possible, instead of experimenting. The lack of shading is mostly because the picture was very well lit (I put the picture in a paint program and turned it black and white, so it was pretty easy to see what was dark and what was not). Usually, for drawing, I get that contrasts are more effective. I might try to experiment more with shading in the future!
The outline of the nose probably is a bit too strong, yeah, even if it was pretty noticable in the original picture too.
As for the lack of symmetry when it comes to the thickness of certain lines, you're totally right. I just didn't think about it much at the time. For some reason, the bottom of the face has different thickness on both sides too. I wouldn't say it's the ear that's rushed though, but more everything that's around it.
As for shading under the eyes, there wasn't really much more in the real image, but there is the slightest hint of a line a bit more below, which I should've included but missed. I think that would've helped with what currently looks a bit odd; I see it too.
I would've erased the smudges elsewhere, but I have the worst erasor ever, so I wanted to use it as conservatively as possible xD
Using it would've just left a lot of weird super-white stuff around the face, with different kinds of black smudgings here and there, unfortunately.
Your random thoughts are pretty helpful!
Thanks for the tips :)