I am a professional Tattooer and I use this app every day at work.
This app looks simple at first, but has extremely powerful and flexible tools for illustration, painting and sketching. The tools are arranged in a thoughtful way and are easy to use, however if you dig down into all the settings and customizations there is not a lot this program cant do. Comparisons to Photoshop; it does not have a proper magic wand, but there are ways around it. I have all but stopped using all other drawing apps on my iPad Pro. The only negative thing I can say about it has to do with the Club part of the app. When navigating the Club community the buttons seem slow to respond when trying to load different pages.
Grandtheftfu about Sketch Club, v2.4.1