I just used normal printer paper in our epsom inkjet printer. There are some lines from the printer but my hope was having a full wall of the drawings would distract from that. Ideally I think you’d have a local shop print them on matte cardstock at at least 300dpi but I’m not extremely knowledgeable on this. I mainly wanted to be able to see the drawings I’ve done. Having them tucked away on the iPad it was easy to forget all the time and effort I’d put into them. Now I can glance up and think about what I’d like to draw next and feel like I’ve actually made something. 😅