Still knitting...but getting closer

I hoped to finish Samus for the Knitting Olympics, but I am not on the podium. However, I did well: the body is finished, and I've cast on for the first sleeve. Unfortunately, I am worried that I may run out of yarn. I'm using Elann's Highland wool that I bought a few years ago, so there's no chance that they will have the same dye lot. I've got 3-4 skeins left.