>>114830619https://img.fireden.net/ic/image/1578/08/1578089309357.gifStop for a bit. Look at your reference, then look back at your drawing.
Keep looking back and forth (literally, moving your eyes back and forth between the reference and your drawing), each time you're looking at the same point in both images, like seeing the nose you just drew and the nose in the reference, then looking at the eyes you just drew and the eyes in the reference etc.
You're comparing every detail that might be wrong, like the proportions, shapes and implied volumes that could be fixed.
The movement you're doing with your eyes when watching this GIF is the same that I do between the Krita canvas and the PureRef window, at about this speed. Focus on each facial detail at a time (first compare the eyes, then the nose etc.). You're not trying to make a 1:1 copy of the reference (since it will most likely not be of the same head angle that you're trying to draw, after all), you're just looking at it to see if you're following the original design, like the distance between the eyes, the distance between the hairline, nose and mouth, and the shape of all of these things.