Black and white cat yawning

This is Spook, our 5 year old black and white cat. I was watching him and taking photos, trying out my new macro lens, when he did a huge yawn and I managed to capture it. I often find that cats start yawning when I'm photographing them - maybe it's a nervous thing; or maybe they're just bored!

In Lightroom, I converted to monochrome, increased contrast, reduced exposure and added a slight dark vignette to darken the background.