Eyes are the most important part of the portrait—they reveal all the emotion. The grid plays an important part in capturing eyes correctly. You will find that every eye is different, so it is important to study your references carefully.
When drawing eyes at an angle, the perfect circles of the irises and pupils turn into ellipses instead (circles in perspective). However, always center the pupil inside the circle of the iris for front-view portraits. The iris is nature's perfect circle, so use a template to ensure the accuracy of these shapes.
Eyes are moist and reflective, so there is always at least one highlight reflected. No matter how many highlights your photo reference shows, reduce it to just one. Place the highlight halfway in the pupil and halfway in the iris, so it does not affect the gaze of the eye.
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