foggy maren cardigan on craftsy. Also on Ravelry called Top-Down Icelandic Sweater by Ragga Eiríksdóttir. Designer Ragga Eiríksdóttir teaches you how to knit a fun, authentic Icelandic sweater from the top down and in the round.
Pinner says: "I LOVE SIRKKA KÖNONENS DESIGNS !" The link doesn't provide any more information so I don't know if this is a one-of-a-kind art gallery piece, or a pattern, or retail, but it sure is gorgeous.