On the way to Kew Gardens I tried drawing some "travel-lines" -
What works for me is adding in the writing - zooming (spreading?) to 1000% or so means that a chubby finger - and thin line width, 2 or 3 pixels - can write most delicately.
At Kew, unexpectedly torrential rain gave time for more sitting inside and more experimentation - this pot plant on a nearby table was done from scratch - ie, no photo underlying it and "merely" being traced. It's all one layer ... just like drawing on a bit of paper.