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Okay, do you see why you need to know Photoshop? For this shot I needed to light and shoot various base cakes and then light and shoot the different icings. I then (using paths) cut the icing off the one base cake and merged it onto the better lit cakes. I used an eraser with a soft brush to help the icing sit on the base and then added a layer as a separate shadow. The shadow layer related to the base layer via "multiply", and the icing just sat on top normally. So there you go: one day to create and style the icings and then two days to shoot, strip and merge the icing, shadow and base cakes. All that work on each X 20 and you have packaging photography! I was paid well and I worked for a friend. What could be better than that?