Above: work in progress. Of course my main resources were the photos of actual Dala horses on the left, but I also copied and pasted a more realistic horse to refer to for the headgear and tail. The tail especially is a bit of poetic licence, as Dala horses don't really have one except when they are sometimes painted onto the back of the body. My sketch is on the bottom right.
Above: the finished t-shirt, which can also be found here. It looks nice in pink too!