Thanks, Rob. I tried the 'reverse the lens method' and it works. Unfortunately, I don't have that much control on the lighting since the reversed lens is almost 1/2" only away from the object I'm shooting! They say the nicest macro would be the 105mm Macro lens. The lens is considerably far from the object so you can properly light up your subject without concerning yourself a lot with the shadows from the lens itself. Extension tubes are also great. I hope I can find a used macro lens dirt cheap at ebay soon.
Btw, your sample shot is very detailed and very clean. Nice work!