Thought I'd post this just in case someone is interested in a similar use case. I'm not an artist at all, but just before Christmas I bought a 9.7 iPad Pro 128 GB and pencil from an OpenBox store here in Vancouver. I decided I was going to give it a try for marking student papers. I teach undergrad and graduate students in online environments and have to make many papers each term. If students haven't given me papers in pdf format, I turn them into pdfs, add them to iCloud drive, and use PDF Expert to mark them up. So far the experiment has been an unqualified success for me. I love being able to underline, cross out, add notes with the apple pencil. Ironically, it took this kind of technology to do (more or less) what I used to do twenty years ago to assignments that were handed in on paper. But there's more flexibility in that I can also type comments if I want, no papers to carry around, and it's easy uploading marked up papers for students to see. The iPad still drives me nuts with some of its limitations, but for this use case, for me at least, it's great!