How to create a catchlight in your subject's eyes
A catchlight is the reflection of the light source in the subject's eye, usually characterised by a white shape. Most decent portrait photographers will strive to ensure that there's a good-looking catchlight present in their finished work - and for good reason.
Without a catchlight, your subject's eyes can end up looking a little lifeless and flat. The type of catchlight you have will depend entirely on your main light source: its shape, and how far and how high it is in relation to your subject.
As a general rule of thumb, however, you should try and position the light source so that the catchlight falls at either the 10 or the 2 o'clock position within the subject's eye.
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