Chris, Jeremy, Mihai, Jeong, JurX, Curt, Kabe, Mike,
Thank you all gentlemen, I appreciate your comments
@ Mike: I kind of know what you mean. There are little things here and there that I didn't explicitly copy into the model. For example the top rim is a little more round than in a real can, and the break-away portion is attached to its side in a real can (usually the left side) when it breaks open, also there might be some minor texturing issues and material settings.
@ Mihai: You could be right ... and I was looking at a real can, trying to figure what the heck it is doing under light. The real can does have some glossiness (it looks glazed at some angles and it looks matte at some other times, so I used a two layer material), but I might have gone a touch more on the glaze ... although this can also be subjective (I was staring at the glazing aspect of the rendered image for 2 hours ... zoning out on my desk

)
Here is a reference:
@Kabe: hmm

I will have to disagree about the thickness. The image does show thickness and it is exactly the same as the real thing. You can see it by looking at the 'can' in the foreground on righthand side of the image; there is a tiny bit highlight there on the left side of the opening (some other cans exhibit this highlight too, but not all of them depending on how light hits them). Your point about using a normal map is noted. Thanks

(although the bump is not too bad. No ?)
@Curt: Yes, it is a Rhino image using Jeremy's plugin. The letters are indeed a bump-map.