I looked up both words to find images on the free image search here. Smug (feeling very pleased with yourself, but in a selfish sort of way) came up with a picture of a mug. Smarmy (pleased with yourself whilst not thinking much of others) came up with salami sandwiches.

I’m tempted to post a dictionary description for both these words as I know I probably haven’t got them right, but I’ll leave that to you. I just enjoy using interesting and different words.