Rinse the cooked shrimp under cold water to cool.
In a large mixing bowl, combine the mixed greens.
Add the cooled shrimp to the bowl.
Slice the avocado and gently add to the salad.
Halve the cherry tomatoes and add to the bowl.
Thinly slice the red onion and sprinkle over the salad.
In a small bowl, whisk together olive oil and lemon juice.
Drizzle the dressing over the salad and toss gently.
Season with salt, pepper, and garnish with fresh herbs.
Serve immediately.