6:33 PM, Monday October 5th 2020
Hi!
I'd like to point you to this article if you haven't already read it: https://drawabox.com/article/ink
That said, starting from Lesson 2, to receive official critique you must submit your works in ink using 0.5 fineliners / felt-tip pens. You can use a ballpoint pen for Lesson 1 and the 250 Box Challenge.
In alternative you can try to get community feedback working digitally, but some people would be less inclined to review your work.
If you really want to do Drawabox digitally and get some feedback, probably the Discord server it's the best option.