Hey Zoya,
I really don't know whether its a tip or not but if your basic shape or structure of the drawing is good then you can eventually get better at colouring it in any medium by practising at least once in a week. And by basic shape i mean the simplest form in which you see a thing. For example the simplest form of a wine glass could be a large oval with a sitck and a small oval for base.
Hope this will help you and if not then feel free to ask anything.
From where do you get ideas for your work?
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