For main dish salads, I usually count on 2 cups (5 ounces) of salad greens per person. This is, of course, a completely subjective amount. You may want more or less salad greens per person.  If you want to serve more greens than 2 cups per person, you likely won't need to increase the amounts of any of the other ingredients, unless you also want to serve more than 1/2 pound of salmon per person. This recipe makes more than enough citrus vinaigrette to dress more greens. Likewise, the recipe for almond salsa makes more than enough for the recommended amount of greens in this recipe.