I had a similar problem when I first started using Alby's roster as I just copied over the roster file into my saves folder. I noticed that some players were headless and had white arms. So I copied over all the .png files Alby included for extra players into the main NBA 2k12 folder and that seemed to correct the issue. So I believe you just need to download a cyberface file for Stiemsma and that should correct the issue. Hopefully that helps.