Okay, here's the process of one of the WoW TCG cards I did for the Throne of Tides
(It's a big file, so be patient and let it load, or try the 'download' link if it's not working)
The final PSD is about 6000 x 4000px, and I ended up with ~10 layers + a couple of adjustments. The whole thing probably took around 9-10 hours or so.
Here's the final image; enjoy!