I learned so much doing this sweater: a cable, and the wonderful mattress stitch for seaming it together.
The yarn is Sandes Garn DUO, 55% merino 45% cotton and I used 4mm needles.
I am gaining confidence and now consider myself close to an intermediate knitter...no longer a complete beginner.
Thanks to all of you who contribute with advice and information, this is a great community.
Very well done! The sweater looks adorable.