Nice job on finishing that bow, Cam! The work you did with the beavertail looks awesome! Also, the tips look slick. I also see you've made a string with the brown/tan B50 you got from me as well. Really nice work! Your Dad should very pleased with that!
The dark spots on the rawhide are actually patches of dried connective tissue on the flesh side of the rawhide. I think it makes an interesting 'camo' pattern.