In a medium bowl, whip the heavy cream and vanilla. When medium peaks start to form, add the powdered sugar, creme fraiche, and lemon curd. Beat just until stiff peaks form; chill until ready to use.
Depending on the size and shape of your dish, you’ll want to divide your pound cake, berries, and whipped cream in half or into thirds.
In a large glass bowl or parfait dish, add a layer of pound cake, followed by the whipped cream mixture, strawberries, more whipped cream, cake, whipped cream, and blueberries and raspberries.