Though I can't say that the illustrator bent over backward to imitate reality here, it can be said that this is a clever way to sell Guinness. The portion representing the foam head gives this piece a nice sense of color balance.
This app icon is very strong. Based on text, visual elements and colour the design makes it very important. The gradient with a drop shadow representing the S is a good concept. The visual elements of the cutlery symbolises the application very simple.