The sleeves are done in "elm stitch" which is a pretty stitch but very, very slow. The front side is simply knit, but on the back side one has to do a yarn over, purl two stitches and then pull the yarn over. It's a lot of stopping and starting, but adds a lacey look to the sweater.
The motifs are done in double-stitching which is a lot of fun. However, I was surprised to find that the spots on which the sweater is embroidered become hard and inflexible, altering the pliability of the knitted fabric. I guess I should have anticipated that this would be the case, but I didn't. I don't think it will make that much difference in comfort for an outer garment.
On the back is this cute little butterfly.