In a small bowl or jar, whisk together the olive oil, balsamic vinegar, honey, Dijon mustard, salt, and pepper until emulsified. Set aside.
In a dry skillet over medium heat, toast the pecan halves for 2-3 minutes, stirring frequently, until fragrant and lightly browned. Remove from heat and let cool.
On a large white platter or in a wide salad bowl, arrange the mixed greens and arugula in an even layer.
Artfully scatter the peach slices, blueberries, crumbled feta, and toasted pecans over the greens. Drizzle with the honey balsamic vinaigrette just before serving.
Toss gently if desired, or serve as a composed salad. Enjoy fresh.