Amu, very nice drawings! Regarding the eyes on the side tilt, I think it may be an alignment issue. If I hold up a straight edge such as a pencil to the line of the lips and the line under the. nose and then carry up to the eyes, that is where I see the eyes are not in total alignment. For example, I think the indentation by the left eye may be too low and the left brow lower than the right. Try it and you might see what I mean.
line quality is good as always, for eyes in different angles, I think u can imagine the eyes as an oval with different degree(we learnt that in basic course) when u re doing head studies. Although I don't see any issues in the side tilt, except for the neck(stretching side) could be less curvier to emphasize it's stretching, you can do a tracing, focus on the eyes for the side tilt to find the oval. Hope that helps.
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