Always good to see this often forgotten franchise receiving sprites.
The character known as "Ai" is a movie character who doesn't have the triangular orange nose and instead has a black dot in that place. I don't know whether you knew this or not but just for reference.
If you are keeping the orange triangle nose I'd suggest making the nose thinner, it stands out too much from the face. Maybe tone down the two sparkles in the eyes...you could make the lower sparkle grey instead of white. Will still have the intended effect but won't be as bright.
The character known as "Ai" is a movie character who doesn't have the triangular orange nose and instead has a black dot in that place. I don't know whether you knew this or not but just for reference.
If you are keeping the orange triangle nose I'd suggest making the nose thinner, it stands out too much from the face. Maybe tone down the two sparkles in the eyes...you could make the lower sparkle grey instead of white. Will still have the intended effect but won't be as bright.