"Some of the most beautiful lighting you'll be able to attain comes from completely natural sunlight. For phones especially, this is often your best opportunity to get true-to-colour, well-illuminated photos without using some form of external lighting. The sun is going to be a surprisingly reliable light source for helping us to take pictures.
Even when I'm using a flash in my shots, I prefer to shoot during the daytime with indirect sunlight pouring through the windows. This gives my camera faster autofocus and it gives me a better opportunity to capture what I'm aiming at accurately. It's the cheapest form of light (woo, nature) and can offer the most flattering, true coloration for your cats. It's also one of the best options for those of us who have black cats.
Natural light is best utilised when it illuminates the subject indirectly, or from the side. If your angle of approach has the sun beating down directly on your subject's face, it'll be harder to balance the rest of the shot. Similarly, if your subject is eclipsing or obscuring any part of the primary light source, the exposure levels will be all over the place. This is most notable if you're shooting at a cat looking out or sunbathing in a window. I'm betting many of you have experienced this scenario before, and the resulting shot can be pretty rough. So here's how we fix it."
Image Source: Andrew Marttila