Example: I see the roll of the waves coming in a roar up to the shore. The waves beat over and over on the beach. Each wave is the same and yet every wave is unique. I saw the sun covered by a cloud which reflected the light so that rays spread out in all directions. The salt smell of the spray felt fresh and clean. The cool foam of the edge of the wave covered my feet as they sank down in the sand. I walked along swinging my sandals in one hand. I took pictures of the sand, the gulls, the waves, then embarrassed, I took a selfie of myself against the ocean waves.
Although reflective writing is more casual than other types of academic writing and does not usually require extensive research and citations, it will be held to the same standards as any other type of writing in terms of punctuation, grammar, clarity and logic. Don't get sloppy. Take the time to reflect in depth on your metacognitive processes -- not just the facts you have learned, but the way in which your mind analyzed and organized these facts. After you've written a first draft, reread it with an eye to uncovering deeper layers of insight and previously unseen connections. And be honest. Insincerity is often easy to spot and makes the entire exercise pointless.