I'm not the Safety Police so please don't dump on me but there are a lot of things wrong with that picture. No safety glasses, no chaps, no helmet, no hearing protection, no gloves.
I almost did myself some real harm a couple of years ago. I'd been using a chainsaw without chaps for years, wearing just jeans. One day I woke up and bought a pair of chaps. Not six months later I was cutting brush at the end of a long day and was bagged. Without thinking I rested the still moving chain on my leg. The Kevlar did what it's supposed to and stopped the chain dead in it's tracks. Someone later said chainsaws don't cut, they rip! Looking at the damage to the chaps I would have likely bled out befiore I got help. Apart from a good pair of chaps ruined I walked away without a scratch.
I now look like RoboCop. I wear an approved helmet with face shield, chaps, steel toed boots, hearing protection and I just bought a Kevlar vest and Kevlar gloves. I get ribbed every so often but I still have the old chaps as a reminder!