This app was mentioned in 2 comments, with an average of 1.00 upvote
I like to use this highly complicated app called 'Peppa's Paintbox'. It took me a few years to master it, but once you're skilled enough you should be able to make masterpieces like this. Good luck becoming a PsPB master!
( https://play.google.com/store/apps/details?id=air.com.peppapig.paintbox )
Peppa Pig Paintbox. No permissions whatsoever (or it didn't 6 months ago).