- Use a chef's knife and cutting board to carefully dice the watermelon into 1-inch cubes. Arrange the watermelon pieces in a large mixing bowl. Observe that the watermelon is evenly cut with vibrant red flesh and a juicy appearance. 
- Add crumbled feta cheese and sliced avocado to the bowl with the watermelon. Gently combine the ingredients using a spoon or spatula, ensuring the avocado maintains its shape and feta is evenly distributed. The mixture should look colorful and slightly glossy. 
- Chop fresh mint and basil leaves into small pieces and sprinkle over the salad. Mix well to distribute the herbs uniformly, adding visual brightness and aroma to the mixture. 
- In a small bowl or measuring cup, whisk together olive oil, lemon juice, salt, and pepper until the dressing is well combined and slightly emulsified. The dressing should have a light, glossy appearance. 
- Pour the dressing over the salad and gently toss until all ingredients are coated. The watermelon, feta, and avocado should glisten slightly, with herbs evenly dispersed, creating a fresh, colorful presentation. 
- Serve immediately in bowls, optionally garnished with additional herbs. The final dish should appear vibrant with a mix of reds, greens, whites, and a silky texture from the avocado.