Have a look on YouTube for some good videos.
If you mean the water drop then I believe you need solvent based paints so that the paint is suspended on the water.
For bubbles as such, try with some cut out circles, you need the 'hole' not the 'disc' and mist a very fine shadow over the bottom corner, so for example from 5'o clock around in both ways slightly.
Something like a light blue backed with White would work...
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