Just back for some comments...
Shallow DOF... yes. Unfortunately, I don't think it helped to make anything stand out in this shot. It's just 3 coins on a table. For me, there's nothing very intersting or exciting in this one. The lighting right around the front coin is too bright and I think it detracts from the detail in the coin. Good luck to you!
try to use a neutral background, solid colour. some textures like wood don't reflect light very evenly. it makes a big difference in the overall appeal of the photo. other than that, good sharpness on the lead quarter. and a canadian, too -- extra points for that!