I love that you can finish a painting in well under 30 minutes. The actual painting time for these 30 minute watercolour poppies is considerably less than that. The rest of that time is spent watching the paint and water mingle on the paper - waiting for the right time to add something more.
Painting wet in wet is a bit of a game of chance. I love it. You put water on the paper. You put paint on the paper. You sit back and see what happens.
It is part intentional painting part imagination - just like looking for shapes in clouds.
Once you find the shapes in the painting then it is a matter of patience.
If you add refining details while the paint is still too damp they will disappear into your shape.
If you wait too long those added details can sit on top of the painting like an afterthought.
The only thing to do is to practise, practise practise.