As I am still learning I got fascinated by my own cappuccino in the morning and decided to try to give it a go.
My problem is right now the material of the foam, where I think it really needs improvement for the good foamy/bubble look. Right now it is a combination of sculpting, bump, texture paint and subsurface.
Any ideas how to get there?
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Maybe the foam needs to be displacement mapping from the texture… Maybe you will have to find out how to make your own displacement map from a foam texture.
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Thanks!
I will give it a try to see what I get out with displacement. 
Challenging for me is also the different foam structure between the edge, the middle part and the center (bubbles, holes, size of bubbles and color/subsurface).