The left one other than boobs doesn't feel like a girl if you know what I mean. Body type itself is boy like and her second arm is in the weird location

I am pretty sure there is a free 2d lighting asset in unity asset store - since you talked about lighting in 2d and unity

I am still a beginner so don't take my word for granted.

I like it overall, but ear is a tad flat and square
Eyes are also sort of cut out from the bottom
not sure where light comes from but nose could have some shadow on the side.
And lastly probably, I am not a huge fan of black pixels, I would rather use darker brown, but that's just me

I like it so far but I think it could be more complex considering detail in the hair

Added a few pixels myself just to illustrate my point

and this is my first attempt at making myself out of pixels from back in the day - community helped me a lot

I use gimp, though some more specialized program would do better