OK, as mentioned in the previous post, catch-lights (or highlights of the eye) can really lift a portrait. It applies to both human and non-human subjects and can be achieved using any type of light source.
Basically, a catch-light is that little glint of light in the eye that adds a hint of life to the eye. In this image here, I have deliberately removed the light from the eyes in the portrait on the left. As you can see (I hope), the little sparks of light add a spark of life.

Now you see them, now you don't
How to get the catch-lights there? Well, that’s all part of the fun.
The easiest way is with flash, but you need to try to get the flash away from directly in front of the eye. In good light, the on-board flash will work but in low light, you need to watch for the dreaded red-eye.
If you can use an accessory flash, that would be even better. Hot shoe flashes tend to be higher above the plane of shooting so give a nice highlight. As well, you could invest in an off-shoe cord (or even wireless triggers) to really get the flash away from dead centre.
There are a number of non-flash ways to get catch-lights as well. Just using an alternate supplementary light source will help. In the shot above, I have three light sources. An accessory flash used off camera and two household lamps for that little extra. Any highly reflective object (mirrors, sheets, white paper or a proper reflector) can help by directing a fixed light source to where you want it.
Probably the nicest though, is to use a natural light source such as a well lit window. This has a couple of bonuses: 1) it’s free; 2) it’s fixed; 3) with a sharp lens you get a wonderful reflection in the eye; and, 4) if the light is soft enough (use a curtain if needs be) you get a wonderful soft light for your portrait.
Whatever you choose to do, just try it and see. When looking to do a portrait (animal or human) really look for where the light is and see what a difference it makes. Humans should be easy but animals are a little harder … especially wild ones. However, moving so a light source is at an angle coming from behind you and then getting (or waiting for) the beastie to look at you will get that catch-light there. I know that since learning this tip, I wait that little longer for my bird shots until I see that highlight, and then … bang, down goes the button!




