Here is a cyberface for Wade Miley SP/RP of the Dbacks.
Unzip the file and extract it to your MLB 2k12 main folder.
The cyberface has the number 3564.
You have to use Ty's editor and give Wade the cyberface number 3564.
I know that the eyecolor doesn't really match Wade's real one, but I didn't find a better headshape and I do not know how to change eyecolors separately.