the piggies are great. lots of good suggestions for tails.
you might try a darker shade of the pig color for the body details. use stabilizer under the pigs & loosen the top tension for a good satin stitch. sharp needle. look in your machine manual for advice on good satin stitching. I think a very small blanket-stitch looks very effective also. You are going to have so much fun doing these little piggies !