Once you go on Quick Mask mode you will need to zoom right into the eyes using the zoom tool on your Photoshop toolbar. You can simply draw a selection over across the eyes using your zoom tool, once you release the mouse this will bring the eye area right into focus.

Next step is to select a brush from your toolbar and start brushing, as in painting right on the coloured area of the eye, the iris. You will notice that the brush effect will appear painting the eye area red.

Tip! If you want to go lighter on the brush click on the brush preset picker on the top photoshop toolbar and decrease the hardness of your brush by moving the hardness slider to the left.

Once the brush hardness is reduced paint over the eye again and repeat on the other eye. When done click on the Normal Mode button to go into normal mode, and this will turn the “masked” eyes into selection.

Moving on go to View-> Actual Pixels to view the image in higher resolution. Then go Select -> Inverse and this will make the eyes the only selected part of the picture which will allow us to change their colour.

To do that go Image -> Adjustments -> Hue/Saturation. By playing around with the Hue we are going to change the colour of the eyes. Before that we do not want to apply the Hue effect on the whole picture that’s why we do View -> Extras, deselect Extras.

Back to the Hue/Saturation window, we reduce Saturation just a little bit and finally move the Hue slider around and see the effect that this has on your model’s eyes!

Tip! If you want the eyes really colourful just increase the saturation level. Equally by controlling the lightness slider you can lighten and darken the shades of the colour of your choice.