Enable Curvature and drop the norm_icon_curv into the Curvature Map Slot. Voilá, We have curvature!
We can also tweak it a bit by setting Depth to 0.70, Tint to white and Gloss to 0.6. But please, feel free to play with the values and why not add a Point Light to see the nice Curvature Effect in action.
I think we have now the basics covered, time to move on to something more advanced. We will now make a Reflection Material where we also learn some basic masking techniques.
Next → Reflection and Masking