Combine the watermelon and strawberries in a blender and blend until smooth; add a splash of the vodka if needed to get the fruit pureed.
Strain into a large pitcher; you will need about 4 cups total juice. Add the rose, vodka, orange juice and liqueur and stir to combine. Add the orange and lime slices, cover and refrigerate for at least 1 hour and up to 24 hours. Just before serving, add the reserved strawberries. Serve in glasses over ice.