Nice metallic sheen on this!

Very possible! If you're using layers with effects like multiply or overlay it can cause colors to just get wild. I don't think using layers are an issue but once you start using them to "make" the colors for you like that it ends up getting a little messy in color count.

I did realize it was a lot, though I thought some detail and dimension in the shine and shadow would be lost without the extra, though subtle, colors.

I'll try going over it again to see if I can get the same effect with perhaps just 4 of each hue aside from black. I think most of the extras are coming from the edges where the light changes are most notable.

Dr. Pepper is my go-to, the diet/zero is the best of all sodas imo, as a diabetic lol

I like to put my art through here regardless, just to make sure there's no weird errors from me or the program. 

it's pretty neat, but 35 colors for a can this size is a lot, i do like it tho but there could be a lot of reduction work on this piece

I LOVE Dr. Pepper, amazing work!