Professional Product photo examples
Notice camera angle, soft/sharp focus, depth of field, crop, staging, pose, composition lighting/shadows...

Kulzer's Exmamples

With and without a bounce board/reflector
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Please don't hand in photos like the Pepsi can below.
Notice the cluttered and sloppy background. Poor staging, Poor composition. Poor lighting.

Notice how this Pepsi can is better because of the thought that went into staging, composition, lighting and photoshop work.