Estimated time to finish: 1,5 hours
Tools: Mechanical pencil, 2B, 4B or 5B
            and HB maybe 3H or 4H
            Q-tip or a blending stump.

1. As reference I will use Adriana Lima's eye, because it's a very nice one! Remember to use a detailed and good quality photo as reference.

2. We start first with drawing the basic shape of the eye. It's very important to get the shape right. You can use a normal pencil for this.

3. Let's put in some of the basic lines. It's important to mark the light dot(s) in the pupil/iris. You can also outline some if the black parts that stand out in the reference. I usually use a mechanical pencil for this job.

4. Remember to fill in enough lines so you can get the shading right. Then you can start filling the center of the eye with graphite. I used 4b or 5b for the darkest, and HB and 2H for the light parts.

5. Now you can draw the upper eyelid and outline the lower one (4B or 5B). Draw the corners a bit darker (HB), and we can also add some darker upper eyelashes. Smudge with a blending tool of a Q-tip.

6. The eye is beginning to look a bit realistic now, and we can use a Q-tip of a blending tool to achieve more light tones around the eye. DO NOT smudge the light dot in the pupil!!

7. Draw the rest of the eyelashes and blend more shadow in. Now we can decide how realistic we want the drawing to be. Add as much details as we want, do all of them if you have the patience. I have added some of them.

8. Sketch up the eyebrow, and start filling it in.

9. Draw the rest of the eyebrow, and add shadow around the eye. Make sure to get the tone/shadow almost right, and then blend it. You can also add some tiny skin details, this will make it look realistic.

10. And the finished result should look something like this, at least after some practice. Watch my drawing-videos to see different techniques applied in action.