Designer Rachel Roy took time out of her busy schedule to sit for a Mother’s Day portrait and talk about the joys of motherhood. The icing on the cake? Her beautiful daughters Ava, 11, and Tallulah, 3, joined, too. Her daughters seem to be as stylishly savvy as their mom — Ava styled her Japan Relief T-shirt with a Rachel Roy sweater and Rachel Rachel Roy necklace, while Tallulah was the ideal model for Tory’s Kids Mitra Polo.  See the feature…