I can say that the distortion in proportion is intentional, since that's how the lineart came, and I wanted to keep that really deformed feel.
Could you maybe point out what you mean by some detailed and some non-detailed parts? I'm just curious as to what you mean. You kinda made the point without actually giving me a good example of how to fix it, or where you're being drawn to/away from. Maybe a little more explanation there?